1. The number of known elements up till now is ............. elements.

 The element which has atomic number 12 is considered from

 All of the following elements can form positive ions except 

 When an atom of an element loses one electron or more, it changes into

: Write the scientific term

  The only metal that exists in a liquid state

. Write the scientific term

 An atom that has lost an electron or more during the chemical reaction

Write the scientific term 

 An atom of an element that gives or gains an electron or more during the chemical reaction.

. . Write the scientific term

An atom of an element that neither loses nor gains any electrons.

  right or wrong

.All metals are solids

right or wrong

right or wrong

. Nonmetals have more than four electrons in their outer shells.

right or wrong

right or wrong

right or wrong

. The molecules of gases are diatomic molecules.