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2 năm trước
Natri có nguyên tử khối là 23, trong hạt nhân nguyên tố có 11 proton Sắt có nguyên tử khối là 56, trong hạt nhân nguyên tử có 30 nơtron Tính số p,n,e của natri và sắt
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START YOUR VOLUNTEER WORK TODAY ; Điền T/F task Step 1: Think about why you want to volunteer. Is it because you want to help other people and the community? Do you want to meet new people? Do you want to get work experience? Do you want to make a difference to the world? Do you want to share things with people who are in need? Step 2: Consider the volunteer work you find meaningful, and how much time you can spend on it. Think about what you love to do. Do you want to tutor younger children once a week? Do you want to work in a charity shop? Or do you want to take part in a community clean-up programme? Step 3: Look for an organization or activity in your community. Sign up for it. Stay committed. Ask for help if needed. Have fun as well as you will achieve more if you love what you do. ​

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