Answer:

The atomic numbers of THREE elements X, Y and Z are 3, 11 and 17 respectively. State giving reason which two elements will show SIMILAR chemical PROPERTIES. (2013 OD)

Answer:

Elements Atomic Number Electronic configuration

X 3 2, 1

Y 11 2, 8, 1

Z 17 2, 8, 7

X & Y will show similar chemical properties as both elements have same number of valence electrons, i.e., 1.

Question 7.

The atomic numbers of three elements A, B and C are 11,17 and 19 respectively. State giving reason which two elements will show similar chemical properties. (2013 OD)

Answer:

Elements Atomic Number Electronic configuration

A 11 2, 8, 1

B 17 2, 8, 7

C 19 2, 8, 8, 1

A and C will show similar chemical properties as both elements have the same number of valence electrons, i.e., 1.

Question 8.

Write any one difference in the electronic configurations of group 1 and group 2 elements? (2014 D)

Answer:

Elements of group 1 have one electron in their outermost shell.

Elements of group 2 have two electrons in their outermost shell.

Explanation:

plz mark as braniest