Кроссворд 1.This element has atomic number of 14
2.This element is of 4 period 2 group A
3.It has 1 proton
4.This element has atomic mass of 137,34
5.This elements symbol is Cu
6.This element is 4 period 8 group
7.What is the seventh element?
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ванямна ванямна    1   02.11.2020 06:18    4

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