Atomic Structure/Periodic Table

An isotope has 12 protons. How many valence electrons does this element have?

• 1

• 2

• 12

• 8

Which word or group of words is represented by the word "period" in the term Periodic Table?

• electron shells

• family

• group

• valence electrons

How many electron shells does element (K) use to place its electrons on?

• 19

• 1

• 4

• 39

Draw the atomic structure of "Na."

Tags

NGSS.MS-PS1-1

How would you show the difference between the two isotopes Be-8 (mass number) and Be-9 (mass number) atoms in a drawn out diagram?

• Be-8 should be shown with a larger nucleus than Be-9.

• Be-8 should be shown with one or fewer protons and one fewer electrons than Be-9.

• Be-9 should be shown with one or more neutrons in its nucleus than Be-8.

Tags

NGSS.MS-PS1-1

 How many electrons surround the atom Krypton (Kr)? This atom has an atomic number of 36 and a mass number of 84. 

• 36

• 84

• 18

• 8

Consider the element carbon. How many electrons can be found in a carbon atom? How many valence electrons?

• 12,6

• 6,12

• 6,4

• 4,12

Tags

NGSS.MS-PS1-1

Consider the three isotopes of carbon. What do the three isotopes have in common? Choose all that apply (3).

• they have the same atomic number

• they have the same number of protons

• they have the same number of neutrons

• they have the same mass number

• they have same number of valence electrons

Tags

NGSS.MS-PS1-1

Metals can be described as shiny while nonmetals can be described as dull. What physical property do these terms describe?

• conductivity

• ductile

• luster

Use the periodic table to predict which element is nonmetallic AND a gas at room temperature.

• magnesium

• silicon

• calcium

• argon