Sodium and aluminium have atomic numbers 11 and 13, respectively. They are separated by one element in the periodic table and have valency 1 and 3 respectively. Chlorine and potassium are also separated by one element in the periodic table (their atomic numbers being 17 and 19, respectively) and yet both have valency 1. Explain.

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sodium and aluminium have atomic numbers 11 and 13 respectively.they are separated by 1 element in the periodic table,and have valencies of 1 and 3 respectively. chlorine and potassium are also separated bt 1 element in the periodic table( their atomic nos. being 17 and 19 respc.) and yet both have the valency of 1.Explain the difference.

Q. Assertion :Sodium and aluminium have atomic numbers

11

and

13

, respectively. They are separated by one element in the periodic table, and have valencies

1

and

3

respectively. Chlorine and potassium are also separated by element in the periodic table (their atomic number being

17

and

19

respectively) and yet both have valency

1

. Reason: Cl requires one electron to complete its octet and its valency is

1

while

K

has one electron in its outermost shell which it can easily loose to complete its octet and can attain the most balanced state after forming an octet. So both has valency

1

In the modern periodic table sodium element(atomic number 11) is surrounded by elements with atomic number 3 , 12 and 19 respectively. Which of these have physical and chemical properties resembling sodium?

Q.  In the modern periodic table, sodium (atomic number: 11) is surrounded by elements with atomic numbers 3, 12, and 19 respectively. Which of these elements have physical and chemical properties resembling sodium?

Q. Three elements 'X', 'Y' and 'Z' have atomic numbers

7, 8,

and

9

respectively. State their positions (group number and period number both) in the modern periodic table.

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