Periodic Table

If someone told you they had an atom that had 10 protons and 11 neutrons, what would the mass of that atom be?

• 10

• 11

• 21

• 1

Tags

NGSS.MS-PS1-1

If I had an atom with 5 electrons and 5 protons, what is its atomic number?

• 5

• 10

• 15

• 20

Tags

NGSS.MS-PS1-1

If an atom had a mass of 20, and 5 protons, how many neutrons does it have?

• 20

• 5

• 15

• 25

Tags

NGSS.MS-PS1-1

Elements in a family or group in the periodic table often share similar properties because...

• they look alike.

• they are found in the same place on Earth.

• they have the same physical state

• their atoms have the same number of electrons in their outer energy level

An element that is a very reactive gas is most likely a member of the...

• noble gases

• alkali metals

• halogens

• actinides

Which of the following metals is most reactive?

• Sodium (Na)

• calcium (Ca)

• titanium (Ti)

• All metals have the same reactivity

The noble gases have ____ electrons in their outer energy levels.

• few

• about a half-complete set of

• an almost complete set of

• a complete set of

Alkali metals are the most reactive of all the metals because they have ____ electron(s) in their outer energy level.

• 1
  
• 2
• 7
• 8

Why would you NOT want to handle alkali metals with your bare hands?

• Alkali metals are acidic and can corrode the skin.

• Alkali metals are gases at room temperature.

• Alkali metals can react with the moisture on your hands and burn your skin.

• Alkali metals are toxic and can be absorbed through your skin.

Which of the following are properties of alkali metals (think back to the demo video)?

• brittle (hard), very reactive

• shiny, soft, reactive

• unreactive, not shiny

• somewhat shiny, brittle (hard)