Electrons
a have a neutral charge
b are found in the nucleus
c are positively charged
d have a negative charge

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

Which metal exist in liquid state and can be cut with knife ?

Correct relationship between molecular formula and empirical formula