First 20 Elements and Their Class

The element with atomic number 1 is

• H

• He

• Ne

• Sc

Argon is the _______th element of the Periodic Table.

The chemical symbol for Potassium is

• Po

• K

• k

• po

The 19th element will have atomic number ______, and chemical symbol _________.

• 19, K

• 19, Po

• 20, Ca

• 13, Al

The element with the chemical symbol Li is known as:

• Lithasium

• Liodine

• Chidium

• Lithium

The set(s) of elements arranged correctly in the order of INCREASING atomic number is:

• Ar, Ca, K

• Si, P, S

• Na, Mg, Al

• N, O, F

The element having atomic number 2, is denoted by:

• Be

• He

• Li

• Mg

Na is known as __________, while S is known as ________.

• Sodium, Sulphur

• Sulphur, Sodium

• Niacin, Selenium

• Nalirium, Sodium

P is known as ___________, while K is known as ___________.

• Potassium, Kalium

• Potassium, Phosphorous

• Phosphorous, Potassium

• Phosphorous, Polonium

Si is known as:

• Sidmiun

• Silicon

• Sulphur

• Argon