chin1
Answered

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19.B is the chemical symbol of which element?

Boron
Boring
Balkite
Beryllium

20.Zinc (Zn) has an atomic number of 30 and an atomic mass of 65. How many neutrons does a stable atom of Zn have?

30
35
60
95

Sagot :

Number 1 is..Boron 
Number 2 is ..35
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