Chemistry, 02.03.2021 09:20 AleciaCassidy

Test de evaluare la Chimie, clasa a VII – a Masă atomică - mol de atomi. Învelișul electronic
2p. 1. Calculează masa atomică relativă a atomului de neon știind că este format
din trei izotopi în următoarele proporții:
2010Ne = 89,97%; 2110Ne = 0,76%; 2210Ne = 9,27%
2p. 2. Ce masă au 2 moli de atomi de Cu, respectiv 2 moli de atomi de Fe? Se
dau: AFe = 56; ACu = 64
2p. 3. Calculează câți moli se găsesc în 50g de: a) carbon; b)sulf; c) calciu; d)
sodiu Se dau: AC = 12, AS = 32, ACa = 40, ANa = 23
2p. 4. Modelează structura învelișului electronic pentru:
Z=16S; Z=12Mg; Z=13Al; Z=10Ne

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Test de evaluare la Chimie, clasa a VII – a Masă atomică - mol de atomi. Învelișul electronic
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