SSLC (English Medium) कक्षा ९ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

Write the advantages of the Modern Periodic Table.

Write the differences between mixture and compounds.

Every atom has an equal number of protons and electrons. The nature of the atom is ______.

The No. of electrons in the outermost shell of the atom of an inert gas ______.

The Atomic number of an element is 20. It has ______ valence electrons. 

A ______ number describes a specific aspect of an electron.

When an atom gives electrons from its outermost shell, it becomes ______ charged.

The elementary particles such as protons and neutrons are collectively called ______.

______ = No. of protons = No. of the electrons.

 ‘A’ is denoted by ______.

‘Z’ is denoted by  ______.

Mass No =______ + No. of Neutrons.

Mass No. 27 is for the element ______.

Electrons revolve around the nucleus in definite open shells.

K and L shells can accommodate a maximum of 2 and 8 electrons respectively.

In a neutral atom number of protons is equal to the number of neutrons.

If an atom has 6 electrons in its outermost shell, it is inert.

Match the following:

Match the following:

If element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?