periodic table

who discovered the first scientific and systematic periodic table

• Henry Mosley

• Dmitri Mendeleev

• John Dalton

• sir Isaac Newton

choose the correct statement

• the vertical column in the periodic table is called period

• the vertical column in the periodic table is called group

• the horizontal row in the periodic table is not called period

• none of the above

how many groups are there in modern periodic table

• 8

• 9

• 18

• 17

Number of valence electrons in halogens is ..........

• 1

• 4

• 3

• 7

Sulphur is........

• Non metal

• Metal

• Metalloid

• Inert gases

What does the 6 represent?

• atomic mass
• atomic number
• element name
• chemical symbol 

What does 12.011 represent?

• atomic mass
• atomic number
• element name
• chemical symbol 

What does the C represent?

• atomic mass
• atomic number
• element name
• chemical symbol 

These are found on the Periodic Table.

• Compounds
• Elements
• Mixtures

the basic structural unit of matter

• atom

• matter

• element

• nucleus