1. Isotopes have same atomic weight.   True   False   2. An atom consists of a central nucleus containing positively-charged protons and negatively-charged neutrons.   True   False   3. Electrons are present in the nucleus.   True   False   4. Isotopes have similar chemical properties.   True   False   5. Neutrons are negatively-charged.   True   False   6. In a neutral atom, the number of neutrons and protons is equal.   True   False   7. Atomic number of an element is the number of neutrons present in the nucleus of the atom.   True   False