Higher Chemistry - Unit 1 - Periodicity

What makes a valence electron more attracted to the nucleus?

• less distance between the nucleus and having less protons
• less distance between the nucleus and having more protons
• more distance between the nucleus and having less protons
• more distance between the nucleus and having more protons

Tags

NGSS.HS-PS1-3

What is the tendency of an atom to attract electrons towards itself?

• atomic radius

• ionization energy

• shielding

• Electronegativity

The higher the ionization energy...

• the more attracted the valence electron is to the nucleus
• the less attracted the valence electron is to the nucleus
• the more attracted the valence electron is to another electron
• the less attracted the valence electron is to another electron

Tags

NGSS.HS-PS1-1

Which is larger... P or P^3- ?

• P^3- because it gains an energy level
• P^3- due to extra electron repulsion
• P because it loses an energy level
• P because of extra electron repulsion

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Why does ionization energy decrease going down a group?

• Adding more energy levels makes the ve- further from the nucleus
• There are more valence electrons in the outer shell
• There are more protons  in the nucleus
• There are less protons in the nucleus

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Why does electronegativity increase across a period?

• Adding more energy levels makes the ve- further from the nucleus
• There are more valence electrons in the outer shell
• There are more protons  in the nucleus
• There are less protons in the nucleus

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which is smaller... Mg or Mg²⁺ ?

• Mg because it gains an energy level
• Mg due to extra electron repulsion
• Mg²⁺ because of extra electron repulsion
• Mg²⁺ because it loses an energy level

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

List the following from largest to smallest atomic radius.
P, Cs, Co, Sr

• P, Co, Sr, Cs
• P, Cs, Co, Sr
• Cs, Sr, Co, P
• Sr, Cs, Co, P

Tags

NGSS.HS-PS1-1

What happens to atomic radius across a period?

• the atoms get bigger because the nucleus is bigger as more protons are added

• the atoms get bigger because there are more ve-

• the atoms get smaller because with more attraction to the extra protons, the e- cloud moves closer to the nucleus

Tags

NGSS.HS-PS1-1

Which statement is correct

• Electronegativity decreases as you go acorss the period as the electrons are further away from nucleus

• Atomic radius decreases as you go across period as the nuclear charge is stronger which pulls the electrons in closer

• Ionisation energy increases as you go down group as there is a stronger pull on outer electrons

• Atomic size increases as you go across the period as the atom gets bigger