The Periodic Table: Structure & Classification

Question 1

The periodic table is a list of all known elements arranged in order of

Answer 1

increasing atomic number

Question 2

Elements with one shell are placed in the

Answer 2

Elements with one shell are placed in the first row (i.e. H and He)

Elements with two shells are placed in the second row (Li to Ne) and so on.

Question 3

The outer electrons are known as the

Answer 3

valence electrons.

Question 4

A row of elements thus arranged is called a period. The period number, n, is the

Answer 4

outer energy level that is occupied by electrons.

Question 5

Since the electronic configurations of H and He are unusual, they do not fit comfortably into any group. They are thus allocated a group based on

Answer 5

similarities in physical and chemical properties with other members of the group

He is placed in group 0 on this basis, but hydrogen does not behave like any other element and so is placed in a group of its own

Question 6

The s-block elements are all those with only s

Answer 6

with only s electrons in the outer shell

Question 7

The p-block elements are all those with at least one

Answer 7

p-electron in the outer shell

Question 8

The d-block elements are all those with at least one

Answer 8

The d-block elements are all those with at least one electron valence in d orbital

Question 9

The f-block elements are all those with at least one

Answer 9

Valence electron in f orbital

Question 10

S,P,D,F how many electron pairs in each orbital

Answer 10

S 1 pair (2 electron)

P 3 pairs (6 electron)

D 5 pairs (10 electron)

F 7 pairs (14 electrons

Question 11

How to write short hand configurations

Answer 11

go to nearest noble gas then put that in brackets and finfish the electron configuration from the noble gas