1. An atom consists of a central nucleus containing positively-charged protons and negatively-charged neutrons.   True   False   2. Atoms are electrically neutral.   True   False   3. Neutrons are negatively-charged.   True   False   4. Atomic number of an element is the number of neutrons present in the nucleus of the atom.   True   False   5. Nucleus always contains a neutron.   True   False   6. The nucleus consists of protons and neutrons and is negatively-charged.   True   False   7. The atom is mainly empty.   True   False