Classification of Elements

The atoms along the staircase are called 

• metals

• nonmetals

• metalloids

• noble gases

An atom of an element has the electronic confi-guration 2,8,2. To which group does it belong?

• (a) 4th group

• (b) 6th group

• (c) 3rd group

• (d) 2nd group

The arrangement of elements in the Modem Periodic Table is based on their

• (a) increasing atomic mass in the period

• (b) increasing atomic number in the horizontal rows

• (c) increasing atomic number in the vertical columns

• (d) increasing atomic mass in the group

Select the element that is a nonmetal

• N

• Cu

• Ni

• Na

The atom of an element has electronic con-figuration 2, 8, 7. To which of the following elements would it be chemically similar?

• (a) N(7)

• (b) P(15)

• (c) Na(11)

• (d) F (9)

Tags

NGSS.MS-PS1-1

The elements with atomic numbers 2, 10, 18, 36, 54 and 86 are all

• halogens.

• nobel gases.

• nobel metals.

• light metals.

Pick out the correct statement regarding Mendeleev's periodic table.

• Mendeleev predicted periodicity based on the similarities of physical properties of the elements only.

• All the elements fit the classification with increasing atomic weight.

• The elements in a group are not similar in their properties.

• Mendeleev predicted the existence of Eka-Aluminium and Eka-Silicon.

Element ‘X’ forms a chloride with the formula XCl2, which is a solid with high melting point. X would most likely be in the same group of the periodic table as:

• Si

• Mg

• Al

• Na

Carbon belongs to the second period and Group 14. Silicon belongs to the third period and Group 14. If atomic number of carbon is 6, the atomic number of silicon is

• (a) 7

• (b) 14

• (c) 24

• (d) 16

What is the main purpose of classifying elements?

• To determine the atomic mass of elements.

• To organize elements based on their properties and behaviors.

• To identify the color of elements.

• To classify elements based on their historical discovery.

Answer explanation

The main purpose of classifying elements is to organize them based on their properties and behaviors, which helps in understanding their relationships and predicting their reactions.