Well theres not a question but a covalent bond is when you share electrons.
Answer:
True statements are 2, 4, 5
Explanation:
They can be broken down by chemical means because we need to break chemical bonds between two (or more) atoms.
They are pure substance because one can't separate them by physical means.
When one separate compounds on two (or more) substances, there are two (or more) different species and they all act differently.
Answer is potassium and sodium. They are in the same group and that means they have the same properties. They are all alkali metals
C=m/MV
=>1.5=m/40 x 100
=> m=1.5*40*100
=6000g
