attempts of elements classification

The Scientist who left gabs to be filled with suitable discovered elements in the future

• Moseley

• Rutherford

• Bohr

• Mendeleev

The atomic No. of the red element is

• 15

• 7

• 5

• 8

Tags

NGSS.MS-PS1-1

The nucleus of atom contains

• positive electrons

• negative electrons

• negative protons

• positive protons

Tags

NGSS.MS-PS1-1

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

• Mendeleev

• Bohr

• Rutherford

• Moseley

Tags

NGSS.HS-PS1-8

Number of energy sublevels is

• 5

• 7

• 4

• 6

In the modern periodic table no of groups is

• 18

• 7

• 67

• 118

In the modern periodic table the block d is

• Noble gases

• Transitional elements

• Metals

• Non-metals

The transitional elements starts from period

• 5

• 4

• 3

• 6

Elements of the group 6A in periodic table have the same

• No. of protons

• No. of Neutrons

• No. of energy levels

• No. of electrons in outermost energy levels

The element X¹² is located in ....... in the modern periodic table

• period 2 group 2A

• period 2 group 3A

• period 3 group 2A

• period 3 group 3A