chap 2 chem test

Question 1

What subatomic atoms equal to each other?

Answer 1

electrons = protons

Question 2

What are isotopes?

Answer 2

isotopes have the same number of protons but different number of neutrons

Question 3

What is core charge?

Answer 3

The core charge of an atom is a measure of the attractive force felt by the valence shell electrons towards the nucleus.

Question 4

How do you find core charge?

Answer 4

number of protons in the nucleus - number of total inner shell electrons

Question 5

What are critical elements?

Answer 5

Elements that are heavily relied on for industry & society in areas such as renewable energy, food suppply, electronics and medicine. E.G: platinum used as a catalyst

Question 6

Compare between the Schrodinger vs Bohr

Answer 6

Bohr regarded electrons as particles that travel along a defined path in circular orbits.
Shrodinger’s response is that electrons behave as waves and occupy a three dimensional space around the nucleus.

Question 7

Why does 4s come before 3d?

Answer 7

4s electrons are farther and more loosely held by the nucleus as compared to 3d.

Question 8

What is the trend for reactivity of metals in the periodic table?

Answer 8

increases down a group
decreases across a period

Question 9

What is the trend of reactivity in non-metals in the periodic table?

Answer 9

decreases down a group (greater number of shells making it harder to attract electrons)
increases across the period

Question 10

What is electronegativity and atomic radius?

Answer 10

Electronegativity is the ability of an atom to attract electrons toward itself
Atomic radius is a measurement used for the size of atoms

Question 11

What is the trend of electronegativity in the periodic table?

Answer 11

Decreases down a group (The valence electrons are less strongly attracted to the nucleus as they are further from the nucleus)
Increases left to right across a period (The valence electrons become more strongly attraced to the nucleus as the core charge increases).

Question 12

What is the trend in atomic radius in the periodic table?

Answer 12

Increases down a group (The number of shells increases)
Decreases left to right across a period (Core charge increases)

Question 13

What is the trend in ionisation energy in the periodic table?

Answer 13

Decreases down a group (The valence electrons are less attracted to the nucleus as they are further from the nucleus)
Increases left to right across a group (The core charge increases)

Question 14

What is the spdf of the schrodinger model?

Answer 14

s = 2
p = 6
d = 10
f = 14