1. The number of electrons in a neutral atom is equal to its atomic number.   True   False   2. Electrons are present in the nucleus.   True   False   3. The nucleus consists of protons and neutrons and is negatively-charged.   True   False   4. In a neutral atom, the number of electrons and protons is equal.   True   False   5. The atom is mainly empty.   True   False   6. Since an atom of the element sodium contains 11 protons and 12 neutrons, its atomic number is 23.   True   False   7. The elements are arranged in order of decreasing atomic numbers in a table called the periodic table.   True   False