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lethilytytlamson
2 năm trước
C1: Tổng số hạt proton, notron, electron của nguyên tử một nguyên tố là 21. Cấu hình electron của nguyên tố là: A. 1s2 2s2 2p4 B. 1s2 2s2 2p3 C. 1s1 2s2 2p3 D. 1s2 2s1 2p3 C2: Ngtử Y có 12 nơtron và có số hạt mang điện chiếm 2/3 tổng số hạt. Số hiệu ngtử của Y là: A. 12 B. 18 C. 24 D. 8
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