an element X has mass number 35 and atomic number 17.
Write electronic configuration.
Write period number.
0
Write group number.
Write valency.
State whether it is a metal or non-metal.
Write its number of neutrons.
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Explanation:
Given: mass of number of X = 35
No. of neutrons = 18
Atomic number of element X = Mass number - no. of neutrons present
Atomic no. = 35-18 = 17
The electronic configuration of X will be 2, 8,7
X will belong to group no. 10 +7= 17th
X will belong to period 3f as it has three shells.
Since it requires one more electron to get stable gas electron configuration, so the valency is 1.
"X"
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