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Gọi số hạt proton = số hạt electron = 

Gọi số hạt notron = 

Tổng số hạt trong A là 24 :

Số hạt mang điện gấp đôi số hạt không mang điện :

Từ (1) và (2) suy ra 

Vậy A là nguyên tố Oxi , có 8 hạt proton , 8 hạt electron và 8 hạt notron

What do you usually do in your free time? Each person has a different taste. I love listening to music, watching movies and surfing the web in my free time. Music makes me feel relaxed and comfortable. I often listen to light or playful songs. While listening to music I usually do housework so as not to waste time. From time to time I will select unique love movies to watch. Watching movies I can experience many different emotions. I often watch Chinese series. Sometimes I will online facebook to chat with my friends and read information on this social network. Today, facebook gives users a lot of interesting experiences, so I love it. The study time is stressful, so your free time can be used for fun or doing things that you love.

1B

2C

3C

4D

5C

B . does

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