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Answer to all these questions...

Answer to all these questions...-example-1
User Siliconpi
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1 Answer

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15 votes

Answer:

A. Atomic number is 8, mass number of M is 16

B. Oxygen, O

C. 8 valence electrons, valency is 2

Step-by-step explanation:

A. Atomic number = proton number

M2- = 2 extra electrons after forming octet structure, so 10-2=8

8 corresponds to number of protons, so atomic number is 8.

Mass number is number of protons + neutrons = 8+8=16

B. 8 in periodic table corresponds to oxygen

C. Number of valence electrons in an oxide ion is 8, valency is two as it forms -2 charge

User Fwyzard
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