Question

the atom of an element X has 15 protons 15 electrons and 16 neutrons in it (a) what is the atomic number of X (b) what is the mass number of X (c)what is the number of valence electrons in X​

Answer 1

Answer:

Explanation:

A) atomic number = number of positive units = no of negative units

So proton =15 = electron

Atomic number = 15

B) mass number = proton + neutron

Proton = 15

Neutron = 16

Mass number = 15 + 16

= 31

C) total electrons = 15

2 8 5

So balance electron is 5

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Answer 2

Answer:

Explanation:

A) atomic number = number of positive units = no of negative units

So proton =15 = electron

Atomic number = 15

B) mass number = proton + neutron

Proton = 15

Neutron = 16

Mass number = 15 + 16

= 31

C) total electrons = 15

2 8 5

So balance electron is 5

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