1. The atom is mainly empty.   True   False   2. The elements are arranged in order of decreasing atomic numbers in a table called the periodic table.   True   False   3. Isotopes have same atomic weight.   True   False   4. Isotopes have same atomic number.   True   False   5. In a neutral atom, the number of electrons and protons is equal.   True   False   6. Electrons are present in the nucleus.   True   False   7. In a neutral atom, the number of neutrons and protons is equal.   True   False