Periodic classification

The number of periods and groups in the

periodic table are______.

• 6,16

• 7,17

• 8,18

• 7,18

_____ group contains the member of

halogen family.

• 17th

• 15th

• 18th

• 16th

Dobereiner tried to arrange the elements with similar properties into group. So, he called the groups “_______”

Octaves

• Octaves

• Triad

• Metals

• Non-Metals

What happens to the electropositive character of elements on moving from left to right in a periodic table?

• Increases

• Decreases

• First increases than decreases

• First decreases than increases

The electronic configuration of an element M is 2, 8, 4. In modern periodic table, the element M is placed in

• 4 group

• 2 group

• 14 group

• 18 group

Atoms of elements in group 1 have ____________.

• one electron in their outermost energy level

• two electrons in their outermost energy level

• seven electrons in their outermost energy level

• eight electrons in their outermost energy level

Tags

NGSS.HS-PS1-1

The atoms along the staircase are called 

• metals
• nonmetals
• metalloids
• noble gases

Tags

NGSS.HS-PS1-1

Which model represents the most reactive atom?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

According to the periodic Law of elements, the variation in properties of elements is related to their

• nuclear masses.

• atomic number.

• nuclear neutron-proton number ratios.

• atomic masses.

Noble gases were included in Mendeleev's periodic table in the

• 1st Group.

• 7th Group.

• 8th Group.

• None of these