An atom of element (Z) has 22neutrons and 18protons in nucleus. What are the mass no. no. of valence electron and group no. of the atom?
Answers
Answer:
Mass number = no. of neutrons + no. of protons
= 22 + 18
= 40
No. of electrons is equal to no. of protons, so,
No. of electrons = 18
No. of electrons in 1st ( K ) shell = 2
No. of electrons in 2nd ( L ) shell = 8
No. of electrons in 3rd ( M ) shell = 8, so,
No. of electrons in valence shell = 8, as the outermost shell is the valence shell.
Group no. is determined according to atomic number, which is equal to no. of protons ( 18, in this case ), so, group no. is 18 ( Noble gases ), according to periodic table.
Explanation:
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Answer:
mass no.- 22+18= 40
valence electron is no. of electron present in outer most cell= 2,8,8.
valence electron =8