1. Electrons are present in the nucleus.   True   False   2. The smallest atom is that of hydrogen.   True   False   3. Atoms are electrically neutral.   True   False   4. The elements are arranged in order of decreasing atomic numbers in a table called the periodic table.   True   False   5. Nucleus always contains a neutron.   True   False   6. Hydrogen and oxygen are combined chemically in a fixed proportion of 2:1 in the compound water.   True   False   7. In a neutral atom, the number of neutrons and protons is equal.   True   False