Answer:
1. Beryllium
2. 4
3. 9
4. 0
Step-by-step explanation:
• The element shown in the image is beryllium because the atom shown contains four protons and the only element with four protons is beryllium.
• The atom's atomic number is 4, because atomic number is the number of protons of an element, and the atom shown contains 4 protons.
• The mass number of the atom is 9. Mass number is the sum of the number of protons and neutrons in the nucleus of an atom, and the atom shown contains 4 protons and 5 neutrons; therefore its mass number is (4 + 5 =) 9.
• The charge of the atom is 0. This is because it has 4 protons which give it a +4 charge, but it also has 4 electrons which give it a -4 charge. Therefore its net charge is: 4 + (-4) = 0.