an element X has mass number 35 and the number of neutrons is 18. identify the group number and period of x.
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Answer:
Given :
Mass number of element is 35
Number of neutrons= 18
Formula to find number of protons:
Mass number = number of protons + number of neutrons.
35=× +18
×=35 - 18
X=17.
Number of protons =17 and number of electrons also will be 17 as atom is electrically neutral.
Hence Element is chlorine
Electronic configuraton:
1s2 2s2 2p6 3s2 3p5
Group number= 17
Period number =3
Valency =1
Explanation:
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