What is the atomic radius?

• The distance from the nucleus to the outer boundary of an atom

• The distance from one side of an atom to the other side

• The distance around the atom

• The distance between atoms in the gas phase

• The distance between atoms in the solid phase

The more protons there are, the  ____ .

• Weaker the pull
• Smaller the electrons
• Stronger the pull
• The bigger the electrons

As you move across the periodic table atoms tend to get smaller because, ______________.

• the atoms have more mass.
• the atoms have less mass
• the atoms have more protons.
• the atoms have less electrons.

Tags

NGSS.HS-PS1-1

Which of these best explains the reasoning behind the trend that as you go across a period, size decreases?

• As you go across a period, more energy levels are added, which shrinks the atom.

• The added electrons in the nucleus give the atom a negative charge, which shrinks the atom.

• The added protons in the nucleus pull the electrons closer to them, which shrinks the atom.

• All of the above

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

As you move down the periodic table atoms get bigger.  This is because ____________.

• The atoms have more mass.
• The atoms have more protons.
• The atoms have more energy levels
• The atoms have more nuetrons

Which one has the largest radius?

• Lithium (Li, atomic #3)
• Boron (B, atomic #5)
• Neon (Ne, atomic #10)
• Nitrogen (N, atomic #7)

Tags

NGSS.HS-PS1-1

The atom with the largest atomic radius in Group 18 is - 

• Ar
• He
• Kr
• Rn

Which of the following elements would be smaller: indium or gallium?

• indium

• gallium

• both atoms are the same size

• cannot be determined

• the sizes can vary

Tags

NGSS.HS-PS1-1

Which of the following elements would be larger: potassium or cesium?

• potassium

• cesium

• both atoms are the same size

• cannot be determined

• the sizes can vary

Which of the following elements would be the largest: copper, zinc, silver or cadmium?

• copper

• zinc

• silver

• cadmium

• cannot be determined