13. Element A has a mass number of 100 while element B has an atomic number of 118. What will be the number of electrons of element B?
A. 59
B. 60
C. 118
D. 120
14. How many protons, neutrons and electrons are in the neutral atom of cl?
A. 17 protons, 15 neutrons and 17 electrons
B. 17 protons, 17 neutrons and 17 electrons
C. 17 protons, 17 neutrons and 18 electrons
D. 17 protons, 18 neutrons and 17 electrons
15. Which of the following statements CORRECTLY describes atoms, ions and isotopes?
I. Neutral atom has equal number of protons, neutrons and electrons.
II. Atoms are the smallest particles of matter that retain the characteristics of an element.
III. Isotopes are atoms of the same element with unequal number of neutrons in the nucleus.
IV. Ions are atoms with unequal number of protons and electrons and are formed when an atom loses or gains electrons. A. I, II and III
B. II, III and IV
C. I, III and IV
D. I, II, III and IV​