CBSE Class 9 Answered
The atomic number and mass number of an element are 16 and 32 respectively.
(a)Find the number of protons, electrons and neutrons in it.
(b)State its valency.
(c)Is this element a metal or a non - metal?
Justify your answer.
Asked by Topperlearning User | 13 May, 2014, 02:02: PM
Expert Answer
(a) No. of protons = atomic number = 16
No. of electrons = no. of protons = 16
No. of neutrons = Mass number - atomic number
= 32 - 16
= 16
(b) Electronic configuration of element: 2, 8, 6
So, Valency = 8 - no. of valence electrons
= 8 - 6
= 2
(c)The element is a non metal because it has 6 valence electrons and hence belongs to group 16.
Answered by | 13 May, 2014, 04:02: PM
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