Unit 2 Atomic Structure Part 2

Carbon-12 and carbon-14 are isotopes of carbon. How are they similar?

• equal number of protons and electrons

• equal number of protons and neutrons

• equal number of electrons and neutrons

• equal number of protons, electrons, and neutrons

Potassium, sodium, and lithium belongs to group 1A of the periodic table. In what way are these elements similar?

• same valence electrons which gives them similar chemical properties

• same valence electrons which gives them similar physical properties

• different valence electrons which gives them similar physical properties

• different valence electrons which gives them similar chemical properties

Chlorine has two isotopes. Chlorine-35 (75%) and chlorine-37 (25%). What is the relative atomic mass of chlorine?

• 35.45

• 35.55

• 35.65

• 35.75

Phosphorous has an atomic number of 15 and a mass number of 31. Determine its protons, electrons, and neutrons.

• protons - 15, electrons - 15, neutrons - 21

• protons - 15, electrons - 15, neutrons - 16

• protons - 31, electrons - 31, neutrons - 15

• protons - 15, electrons - 15, neutrons - 15

Isotopes of elements will have the same chemical properties because it has similar number of protons.

• true

• false

An unknown element is found to contain 8 protons, 8 electrons, and 9 neutrons. What is the element?

• oxygen

• nitrogen

• fluorine

• carbon

Uranium-238 and Uranium-235 will have similar chemical properties because

• they have the same atomic number

• they have the same mass number

• they have the same number of neutrons

• they are the same element

carbon, nitrogen, oxygen belongs to the same period. What similarities do these elements have?

• same number of energy levels

• same number of protons

• same number of electrons

• same number of neutrons

An unknown element is found to contain 16 protons, 18 electrons, and 16 neutrons. What is the mass number of the element?

• 16

• 18

• 32

• 34

A sulfide ion (S^2-) is similar to an Argon (Ar) atom in terms of

• number of protons

• number of electrons

• number of neutrons

• mass number