Chemistry Quiz 2

Discovered the lightest subatomic particle

Thomson

Discovered the positive nucleus of the atom

Rutherford

Credited with an atomic model where electrons orbit the nucleus

Bohr

First to come up with the idea that the atoms exists

Democritus

Responsible for the most modern model of the atom

Schrödinger

First to do experiments that proved that atoms exist

Dalton

Discovered the neutron

Chadwick

Order of Atomic Model discoveries

Democritus, Dalton, Thompson, Rutherford, Bohr, Chadwick, Schrödinger

How many neutrons are in a carbon- 14 atom? Protons? Mass number?

mass is 14 p+, 8 neutrons, 6 protons

For the atomic symbol, ³⁵Cl^-, how many protons, electrons, and neutrons are there?

mass is 17p+, 18 electrons, 18 neutrons

Write the atomic symbol for the atom that has 12 protons, 10 electrons, and 11 neutrons.

²³Mg²⁺

If the isotope of copper had a 2+ charge, would it now be copper- 67? Why or why not?

No because you can’t change the amount of protons. The only thing that changes are electrons.

Which subatomic particle is located outside of the nucleus?

electron

Describe the similarity between protons and neutrons.

similar mass

Describe one similarity between electrons and protons?

they are both in nucleus

What are atoms of an element that have different numbers of neutrons called?

isotopes

which pair of atoms constitutes a pair of isotopes of the same element?

a. ¹⁴₆X _and ¹⁴₇X

b. ¹⁴₆X and ¹²₆X

c. ¹⁷₉X and ¹⁷₈X

d. ¹⁹₁₀X and ¹⁹₉X

e. ²⁰₁₀X and ²¹₁₁X

b

Which atom has the smallest number of neutrons?

a. carbon- 14

b. oxygen- 16

c. neon- 20

d. nitrogen- 14

e. fluorine- 19

d

a) who conducted the gold foil experiment?

b) what contribution to atomic theory is credited to this experiment?

a. Ernest Rutherford

b. It discovered that atoms were mostly empty space with a positively charged nucleus at the center. Since the particles went straight throught the gold foil. Has a small, dense center

Which subatomic particles are found in the nucleus?

protons and neutrons

The number of protons in a neutral atom is ______ (great than/ less than/ equal to) the number of electrons.

equal to

Mass number = ______+_______

protons and neutrons

How many neutrons does Zr- 94 have?

54 neutrons

How many protons are in thus element, ¹⁹F^-

9 protons

How many elements are in column 2A?

6

How many elements are in period 2?

8

What is the name for the group that fluorine is found in?

halogens

What is the name for the group 2A family?

alkaline- earth metals

True or False? Silicon is a semimetal?

true

True or false? All solids are metals?

false

True or False? All metals are solids?

False

How many elements are gaseous at room temperature?

11

How many elements are liquid at room temperature?

2

Which element is in group 1A but is not an alkali metal?

Hydrogen

Who makes up most of the periodic table- metals, semimetals, nonmetals

metals

true or false? zinc is a good conductor of heat and electricity

true

true or false? it’s reasonable to assume carbon is a non-ductile

true