Question

F. a) Consider the following elements: Be, Li, Na, Ca, K . Name the elements of (i) same group (ii) same period. (2+2+2+4) b) Name the elements whose properties were predicted the basis of its position in Mendeleev’s periodic table. c) Name two elements where atomic weights were corrected on the basis of their position in Mendeleev’s periodic table. d) Write the atomic number and electronic configuration of- (i) Sodium (ii) Phosphorous (iii) Sulphur (iv) Fluorine​

Answer 1

Explanation:

a -

B- M and N

B - 2 -

Gallium (Ga) and scandium (Sc) are the two elements whose properties were predicted on the basis of their position in Mendeleev's periodic table.

C- Gold and platinum are the two elements whose "atomic weights" were corrected on the basis of their position in "Mendeleev's periodic table".

D -

Answer 2

Explanation:

Be 4 2,2

Li. 3. 2,1

Na. 11. 2,8,1

CA. 20 2,8,8

K 19,2,8,82