1. The elements are arranged in order of decreasing atomic numbers in a table called the periodic table.   True   False   2. The nucleus of an atom has almost the entire weight of the atom and it consists of protons and neutrons.   True   False   3. The atom is mainly empty.   True   False   4. The nucleus consists of protons and neutrons and is negatively-charged.   True   False   5. In a neutral atom, the number of neutrons and protons is equal.   True   False   6. Isotopes have same atomic weight.   True   False   7. An element is a substance made up of different kinds of atoms.   True   False