An element X has a mass Number is 35 and number of neutrons is 18. Write the atomic number and electronic configuration of X. Also write group number period number and valency of X.
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0
Answer:
x is sodium (Na)
Explanation:
mass no = no. of protons + no. of neutrons
no. of protons = no of electrons
if mass no. is 35 then,
no. of protons = 39 - 18
=17
no of electrons will also be 17 as protons and electrons are equal in an stable atom
electronic configuration of Na = 2,8,7
1 group, 3 period
valency= (here) no. of electrons to complete the octet
valency= 1
Answered by
1
Answer:
We know :
Atomic number = Mass number - No. of neutrons.
Atomic number = 35 - 18
= > 17
Electronic configuration :
2 , 8 , 7
Group no. = 17
Period no. = 3
Valency = - 1 .
Name of element is Chlorine ( Cl ) .
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