Periodic Table & Trends

The atomic radius of main-group elements generally increases down a group because ________.

• the number of protons increases

• the number of protons decreases

• the number of PELs increases

• the ionization energy decreases

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NGSS.HS-PS1-1

Considering the radius of Cl vs. Cl^-, which of the following statements are true?

• Cl has a larger radius because Cl has fewer protons than Cl^-, so the valence electrons are less attracted to the nucleus

• Cl^- has a larger radius because Cl^- has more energy levels than Cl, which occupy more space

• Cl^- has a larger radius because Cl^- it has more valence electrons, which repel each other and spread out

Tags

NGSS.HS-PS1-1

An element is in Group 15. What is the likely charge of its most common ion?

• 15

• 3-

• 2-

• 1-

• 3+

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following would experience the greatest attractive force?

• Sodium nucleus and its valence electron

• Magnesium nucleus and its valence electrons

• Neon nucleus and its valence electrons

• Uranium nucleus and its valence electrons

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NGSS.HS-PS1-3

NGSS.HS-PS2-4

Which of the following is not a block on the Periodic Table?

• m

• s

• p

• d

Which of the following will have a lower ionization energy than Scandium (Sc)?

• Helium (He)
• Titanium (Ti)
• Calcium (Ca)
• Magnesium (Mg)

Tags

NGSS.HS-PS1-1

Which atom has the largest atomic radius?

• potassium
• rubidium 
• francium
• cesium

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

• the atoms have more protons

• the atoms have less mass

• the atoms have more protons and the same number of shielding electrons.

• the atoms have fewer electrons.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Atomic radius generally increases as we move __________.  

• down a group and from right to left across a period 
• up a group and from left to right across a period 
• down a group and from left to right across a period 
• up a group and from right to left across a period 

Which is larger:

P or P^3- ?

• P

• P^3-

• both have the same radius

Tags

NGSS.HS-PS1-1