LikhoPadho

1.  The symbol Mg for Magnesium is derived from its Latin name Magnesia. 

2.  An element is a pure substance which can be broken down into 2 or simpler substances by a physical or chemical means

3.  The symbol Zn distinguishes element Zn from other elements

4.  Sodium (Na) accepts an electron to achieve stable electronic configuration to the nearest noble gas, Neon (Ne)

5.  The valency of noble gases is always one

6.  The valency of all metals is positive and non metals is negative

7.  A symbol represents 1 molecule of the element

8.  Valency is the no. of electrons an atom can donate or accept to achieve stable electronic configuration to its nearest noble gas

9.  2Mg + O₂  → 2MgO is a balanced equation

10. Sodium (Na) accepts an electron to achieve stable electronic configuration to the nearest noble gas, Neon (Ne)