Atom and Periodic Table

An atom has 15 protons, 12 neutrons, and 17 electrons. What is the net charge of this atom?

• -2

• +2

• 0

• +1

Which subatomic particle is associated with the atomic number?

• electron

• proton

• neutron

Which group of elements all have 7 valence electrons?

• alkali metals

• alkaline earth metals

• halogens

• noble gasses

How many valence electrons does every element in the noble gases group have?

• 1

• 2

• 7

• 8

Which element has 6 valence electrons and 3 electron shells

• S

• Bi

• Cl

• N

Which of the following is NOT a metal element?

• 12 - Mg (Magnesium)

• 25 - Fe (Iron)

• 12 - Al (Aluminum)

• 35 - Br (Bromine)

If an atom has an atomic mass of 40 and it has 21 neutrons, how many protons does it have?

• 40

• 21

• 19

• 61