• Li, K, Rb

• Na, Mg, Be

• C, N, O

• Fe, Co, Ni

Sodium atoms have 11 protons, 12 neutrons, and 11 electrons. In order to make the sodium ion Na⁺ , what must happen?

• It must gain one electron

• It must lose one electron

• It must gain one proton

• It must lose one proton

If an atom has 2 protons and 3 electrons then the atom is

• radioactive

• neutral

• positive charged ion

• negative charged ion

Tags

NGSS.MS-PS1-1

Which group contains the Nobel Gases?

• 1

• 2

• 17 (7)

• 18 (8)

Metals are found where on the Periodic Table?

• To the right of the stairstep line

• to the left of the stairstep line

• along the stairstep line

• no specific location

An atom of chromium has 24 protons, 28 neutrons, and 24 electrons. How many particles are in its' nucleus (atomic mass)?

• 24

• 28

• 52

• 76

The element sodium, Na, has an atomic number of 11 and an atomic mass of 23. Which of these elements is most likely to have similar chemical reactivity as sodium?

• Neon, Ne, which has a similar chemical symbol

• Magnesium, Mg, which has an atomic mass of 24

• Aluminum, Al, which is in the same period

• Potassium, K, which is in the same group/family

If an atom of hydrogen gives up its one electron, what is its overall charge?

• +1

• -1

• 0

• +2

Based on their properties, which substances are most likely metals?

• 1 and 3

• 1 and 4

• 2 and 4

• only 4

The atomic number of an element refers to the number of

• protons in the nucleus

• electrons in the nucleus

• neutrons in the outer shell

• electrons in the outer energy level