1. Atomic weight of an element is the mass of an atom of that element in grams.   True   False   2. In a neutral atom, the number of electrons and protons is equal.   True   False   3. An atom consists of a central nucleus containing positively-charged protons and negatively-charged neutrons.   True   False   4. The nucleus consists of protons and neutrons and is negatively-charged.   True   False   5. The number of electrons in a neutral atom is equal to its atomic number.   True   False   6. Atomic number of an element is the number of neutrons present in the nucleus of the atom.   True   False   7. Isotopes differ in the number of neutrons they have in their nucleus.   True   False