The electronic configuration of an element is 1s2, 2s22p6,3s23p4. The atomic number of the element present just below the above element in the periodic table -
(i) Electronic Configuration -2,8,2
Valency - 2.
(ii) Metal
There are two electrons in its outermost shell and it easily loses them to form a positive ion.
(iii) M -2
O-2
M2O2 = MO
It is a...
EGckonic Configuration of 'P'-2,8,7
Group number - 17
Period number 3rd Period
Electronic Configuration of 'Q' - 2,8,8,1
Group number - 1
Period number - 4th Period
(a) X(20)-2,8,8,2
Valence electrons- 2
Hence valency is 2
(b) It is a metal
(c) XCl2
(d) It is more reactive than Mg as reactivity increases down the group Mg- III Period And X20 (Ca)- IV Period
Atomic number of X = Mass number of X - No of neutrons
=35-18=17
Therefore, Electronic configuration of
X=2,8,7
Croup number =17
Period = 3
Valency=8-7=1
(i) 12.
(ii) 2.
(iii) Be.
Because Be has two electrons in its valence shell. Given element also has two electrons in its valence shell.
Since valence electrons determine the chemical property, hence the...