Classifying the Elements

Which of the following statements is correct about the Periodic Table of Elements?

• There are 18 Groups and 8 Periods in the Periodic Table of Elements

• Periods are the vertical columns of elements

• Groups are the horizontal rows of elements

• Elements which have the same number of valence electrons are arranged in the same group

In the Periodic Table of Elements, R and S are placed in the same group. If the proton number of R is 19, what is the electron arrangement of element S?

• 2.8.1

• 2.8.7

• 2.8.8.2

• 2.8.8.5

The atomic radius of Group 18 elements increases when descending the group. This is caused by

• increase in the number of electrons

• decreasing melting point and boiling point

• decreasing solubility in water

• increase in the number of shells filled with electrons

Tags

NGSS.HS-PS1-1

The reactivity of Group 17 elements gradually decreases when going down Group 17.

This is due to

• atomic size decreases going down the group

• decreasing melting point and boiling point

• colour of elements gradually darkens going down the group

• decreasing strength of the nuclear force of attraction on electron

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Change in physical properties of Period 3 elements from left to right in the Periodic Table of Elements is due to

• increasing proton number

• increasing atomic radius

• increasing electronegativity

• change in physical state from gas to liquid and finally to solid

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

This element has variable oxidation numbers and different colours. This element is

• a metalloid

• amphoteric

• a transition element

• an alkaline earth metal

Which group of elements in the periodic table contains only noble gases?

• Group 1
• Group 10
• Group 13
• Group 18

Alkaline earth metals have only ______valence electrons

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS1-1

The columns on the periodic table are known as ___.

• Groups

• Periods

• Metals

• Nonmetals

Beryllium is in group number______.

• Group 2
• Group 3
• Group 4
• Group 7