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Sở dĩ các khí hiếm không có hợp chất và vì số electron ở lớp ngoài cùng là 8 (hoặc là 2 đối với heli), nên khó nhận thêm electron để liên kết với nó được. Tuy nhiên trong những điều kiện đặc biệt chỉ có vài hợp chất, điển hình như Heli hiđrua - HeH, agon florohiđrua - HArF, agoni ArH, xenon monoclorua XeCl...
~HT~
Các hợp chất hiđro là :
- Liti hiđrua, LiH
- Beri hiđrua, BeH2
- Boran, BH3
- Metan, CH4
- Amoniac, NH3
- Nước, H2O
- Hiđro florua, HF.
Một số các hợp chất của hiđro :
+ Natri hiđrua - NaH
+ Canxi monohiđrua - CaH
+ Amoniac - NH3
+ Photphin - PH3
+ Nước - H2O
+ Hiđro clorua - HCl
+ Metan - CH4
+ Gecman - GeH4
Chăm sóc bảo vệ trẻ em là một trong những vấn đề cấp bách. Chăm sóc trẻ em được tiến hành trên cả 2 mặt: Vật chất và tinh thần. Gia đình với khả năng cao nhất của mình cung cấp cho trẻ em những điều kiện tốt nhất để phát triển về thể chất. Trong điều kiện hiện nay, kinh tế gia đình về cơ bản đã được nâng lên với mức ổn định. Vì vậy các bậc cha mẹ cần dành cho trẻ không chỉ về điều kiện vật chất mà cần chú trọng chăm sóc về mặt trí tuệ. Trẻ em không phân biệt trai hay gái được tạo điều kiện học tập phát triển theo khả năng của mình. Để tạo môi trường chăm sóc thuận lợi, cha mẹ cần tạo một bầu không khí yêu thương, đoàn kết, gắn bó quan tâm giữa các thành viên gia đình, cho dù cuộc sống còn nhiều vất vả, nhưng khi có trẻ em trong gia đình thì các thành viên phải cố gắng bỏ qua những mâu thuẫn, xích mích để cho trẻ em luôn luôn có cảm tưởng rằng ngôi nhà của mình chính là tổ ấm. Với những trẻ em có thiên hướng xuất hiện một số năng khiếu, cha mẹ phải biết phát hiện, khuyến khích tạo mọi điều kiện để ươm mầm tài năng. Việc chăm sóc phát triển trí tuệ cho trẻ em có quan hệ chặt chẽ với việc giáo dục, xã hội hoá trẻ em. Quan điểm giáo dục hiện nay coi gia đình là một trong ba môi trường giáo dục trẻ em quan trọng. Gia đình là trường học đầu tiên và suốt đời của mỗi con người. Bởi gia đình có trách nhiệm thực hiện chức năng giáo dục thông qua 3 giai đoạn phát triển của trẻ em: từ 1-3 tuổi, từ 3-6 tuổi và từ 6-18 tuổi. Cả ba giai đoạn trên, trẻ em được giáo dục, dạy dỗ của gia đình lớn lên chịu ảnh hưởng các chuẩn mực trong gia đình và dần dần tiếp cận các chuẩn mực ngoài xã hội.
Tham khao nha <3
- Dòng chứa tất cả các axit là dòng D.
- Tên các axit đó là
- \(H_3BO_3\) - Axit boric
- \(H_2SO_4\) - Axit sunfuric
- \(H_2SO_3\) - Axit sunfurơ
- \(HCl\) - Axit clohydric
- \(HNO_3\) - Axit nitric
Vừa qua nó bị lỗi dòng, cô gửi lại nhé:
Dòng chứa tất cả các chất axit là dòng D.
\(H_3BO_3-\text{Axit boric}\)
\(H_2SO_4-\text{Axit sunfuric}\)
\(H_2SO_3-\text{Axit sunfurơ}\)
\(HCl-\text{Axit clohiđric}\)
\(HNO_3-\text{Axit nitric}\)
Outside of class, students also have to spend a lot of time self-studying and reviewing at home to be able to absorb and remember knowledge most effectively. Self-study is a modern form of learning widely applied because of the efficiency and convenience it brings. On the other hand, self-study also brings many challenges to learners because this form of learning requires a very high level of discipline and self-discipline. So why does self-study bring any benefits and what is an effective self-study method?
Each student has a different learning method to suit your personality. There are students who feel more focused when studying and listening to music, but there are also students who prefer a quiet study space. In addition, you can choose diverse learning methods that suit you such as drawing mind maps, learning through images, videos,... when spending time studying on your own. Not only that, students can study at an appropriate pace, spending time learning deeply about the issues they care about.When studying on their own, students are completely proactive in choosing study times that suit their schedules and personal habits. For example, there are students who feel they concentrate better in the evening, but on the contrary, there are also students who feel that morning is the right time to study. In addition, each student has a different free time budget and students are completely proactive in choosing self-study time that suits their personal needs.
When studying on their own, students are completely proactive in choosing study times that suit their schedules and personal habits. For example, there are students who feel they concentrate better in the evening, but on the contrary, there are also students who feel that morning is the right time to study. In addition, each student has a different free time budget and students are completely proactive in choosing self-study time that suits their personal needs.
Building a suitable self-study schedule for yourself will be the foundation for building a good habit for students. When studying on their own, students will be trained to be proactive and develop problem-solving skills because they need to proactively explore learning materials as well as find solutions to their questions. In addition, self-study means that students need to proactively arrange their time appropriately, this will help them form habits as well as self-discipline in learning.
Self-study requires high self-awareness and perhaps for many of you, this is the biggest challenge to overcome. Therefore, students should build a timetable suitable to their personal schedule, dividing time for studying, entertainment and time for other work. Note, you should allocate appropriate time so that your body does not fall into a state of fatigue and exhaustion, as well as choose the time when you feel you can concentrate best to study.
After having a suitable timetable, students should avoid the habit of procrastination and adhere exactly to the timetable they set to achieve the best results.
Outside of class, students also have to spend a lot of time self-studying and reviewing at home to be able to absorb and remember knowledge most effectively. Self-study is a modern form of learning widely applied because of the efficiency and convenience it brings. On the other hand, self-study also brings many challenges to learners because this form of learning requires a very high level of discipline and self-discipline. So why does self-study bring any benefits and what is an effective self-study method?
Each student has a different learning method to suit your personality. There are students who feel more focused when studying and listening to music, but there are also students who prefer a quiet study space. In addition, you can choose diverse learning methods that suit you such as drawing mind maps, learning through images, videos,... when spending time studying on your own. Not only that, students can study at an appropriate pace, spending time learning deeply about the issues they care about.When studying on their own, students are completely proactive in choosing study times that suit their schedules and personal habits. For example, there are students who feel they concentrate better in the evening, but on the contrary, there are also students who feel that morning is the right time to study. In addition, each student has a different free time budget and students are completely proactive in choosing self-study time that suits their personal needs.
When studying on their own, students are completely proactive in choosing study times that suit their schedules and personal habits. For example, there are students who feel they concentrate better in the evening, but on the contrary, there are also students who feel that morning is the right time to study. In addition, each student has a different free time budget and students are completely proactive in choosing self-study time that suits their personal needs.
Building a suitable self-study schedule for yourself will be the foundation for building a good habit for students. When studying on their own, students will be trained to be proactive and develop problem-solving skills because they need to proactively explore learning materials as well as find solutions to their questions. In addition, self-study means that students need to proactively arrange their time appropriately, this will help them form habits as well as self-discipline in learning.
Self-study requires high self-awareness and perhaps for many of you, this is the biggest challenge to overcome. Therefore, students should build a timetable suitable to their personal schedule, dividing time for studying, entertainment and time for other work. Note, you should allocate appropriate time so that your body does not fall into a state of fatigue and exhaustion, as well as choose the time when you feel you can concentrate best to study.
After having a suitable timetable, students should avoid the habit of procrastination and adhere exactly to the timetable they set to achieve the best results.
1. Hand-written homework.
=> It can prevent students from copying the answer from Internet but it is also inconvenient and time-consuming. Especially, students that have bad hand-writing can get bad mark just because teacher cannot understand what they wrote. Therefore, I don't want to preserve it.
2. Playing traditional games hide and seek, elas-band jumping, skipping and catch the chickens.
=> I want to preserve it because it's also a good physical activity for children that helps them to be healthier and shape.
3. Obeying your parents/teachers without talking back.
=> I don't want it to be preserved. Sometimes, children should be allowed to speak up, to give their opinions so that parents can understand their children more.
sinh học mà bạn?