Question

2 elements x and y have atomic number 16 and 19 respectively. compare there valency number of protons in their ions and number of electrons in their ions.

Answer 1

Atomic number(z) = No. of protons(p) = No. of electrons(e) -- (z = e = p)
Valance electrons or protons means no. of electrons or protons in last shell.
X = 16
K L M
2 8 6
No. of valence protons = No. of valence electrons = 6
Y = 19
K L M N
2 8 8 1
No. of valence protons = No. of valence electrons = 1
Hence No. of electrons and proton in element x and y are 6 and 1 respectively...
Hope this will helpful for you...
Rahul