Final answer:
Valence electrons in chlorine (17), aluminum (13), hydrogen (1), and carbon (6). Atomic numbers of zinc (30) and neon (10). Atomic mass of carbon is approximately 12.
Step-by-step explanation:
The valence electrons in chlorine (Cl) can be determined by looking at its atomic number, which is 17. Valence electrons are the electrons in the outermost energy level of an atom. Since chlorine is in Group 17 of the periodic table, it has 7 valence electrons.
The atomic number of aluminum (Al) is 13, so it has 13 protons. The number of electrons in a neutral atom is equal to the number of protons, so aluminum also has 13 electrons.
Hydrogen (H) has an atomic number of 1, so it has 1 proton. The valence electrons in hydrogen depend on the context in which it is being used. In general, hydrogen can have 1 valence electron.
The atomic number of zinc (Zn) is 30, so it has 30 protons. The number of electrons in a neutral atom is equal to the number of protons, so zinc also has 30 electrons.
Neon (Ne) has an atomic number of 10, so it has 10 protons. The number of electrons in a neutral atom is equal to the number of protons, so neon also has 10 electrons.
The atomic mass of carbon (C) is approximately 12. It can vary slightly due to the presence of different isotopes of carbon, but the average atomic mass is 12.
Carbon (C) has 6 protons, so it also has 6 electrons. The valence electrons in carbon depend on the context in which it is being used. In general, carbon can have 4 valence electrons.