long form periodic table

An element from the 1st transition series, its last sublevel has three paired electrons, determine it atomic number

• 28

• 25

• 18

• 20

A representative element contains four principal energy levels, the last level has three unpaired electrons, determine Number of valence electrons

• 5

• 3

• 2

• 1

The elements that are characterized by the electronic structure ns2, np6

• noble

• representative 

• transion 

• inner transiotion 

the element its electronic configuration is

• noble

• transition

• represintative

• inner transition

the element its electronic configuration is

• noble

• transition

• represintative

• inner transition

the element its electronic configuration is

• noble

• transition

• represintative

• inner transition

Representative element locates in period 2 and group 5A. its atomic number is

• 9

• 8

• 7

• 6

Transition element locates in period 4 and group 5B. its atomic number is

• 23

• 20

• 18

• 21

4th period of the periodic table contains

• 3 types of elements

• 4 types of elements

• 1 type of elements

• 2 types of elements

the element that its electronic configuration 1s² is located in

• s block

• p block

• d block

• f block