Attempts of elements classification - part 1

The scientist who discovered that the nucleus of the atom contains positively charged protons is ...............

• Mendeleev

• Bohr

• Rutherford

• Moseley

The scientist …….......... discovered the main energy levels.

• Moseley

• Bohr

• Rutherford

• Mendeleev

Elements are arranged in Mendeleev's periodic table in an ascending order according to …..........

• atomic weight

• atomic number

• chemical activity

• valency

The number of energy levels in the heaviest known atom is ……….. levels.

• 5

• 7

• 8

• 10

Elements in ................ periodic table are classified according to their atomic numbers in an ascending order and the way of filling of the energy sublevels with electrons.

• Moseley's

• Mendeleev's

• Rutherford's

• the modern

Mendeleev left gaps in his periodic table because he predicted the discovery of other elements in the future.

• True

• False

In the modern periodic table, the s block contains ...... groups while the p block contains ........ groups.

• 2 , 8

• 2 , 6

• 8 , 6

• 2 , 2

In the modern periodic table, the A groups are found in the s and p blocks.

• True

• False

The scientist ............... added the zero group for the inert gases and lanthanides and actinides groups below the table.

• Mendeleev

• Bohr

• Moseley

• Rutherford

The f block contains ....... groups and can be found ......... the periodic table.

• 6 , on the right side of

• 8 , in the middle of

• 2 , on the left side of

• 2 , below