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Chemical World
Chemical World
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A QUIZ to help you revise the Chemical World topic.
Flashcards
33 cards
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Practice quiz
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Questions
33
Answers
1
How many electrons does calcium have?
20
10
80
40
2
Electron shells have different energy levels and electrons fill..........
higher energy shells first.
lower energy shells first.
3
What can be predicted about an element from its position in the Periodic Table?
Electron arrangement
Chemical properties
Atomic number
All of these answers
4
Isotopes of an element have the same number of protons but different numbers of neutrons.
False
True
5
Which two scientists contributed to the model in the previous question in 1926?
Schrodinger and Dalton
Heisenberg and Bohr
Schrodinger and Chadwick
Heisenberg and Schrodinger
6
Isotopes of an element have the same mass number.
True
False
7
What is the atomic number of an element determined by?
The number of neutrons
The number of quarks
The number of electrons
The number of protons
8
Examine the image. What is the mass number of calcium?
Ca
20
0.078
40
9
Which subatomic particle is neutral or has no charge?
Proton
Neutron
Electron
10
Calculate the number of neutrons in the nucleus of calcium.
20
40
Ca
0.078
11
Which subatomic particle has a negative charge?
Proton
Neutron
Electron
12
The mass number tells us the number of protons and electrons in the nucleus. True or false?
True
False
13
Which subatomic particle has a positive charge?
Neutron
Electron
Proton
14
How do we know that uranium has isotopes from this picture?
Different atomic numbers
Diiferent mass numbers
Different number of protons
Different numbers of electrons
15
Based on the electron arrangement or configuration of calcium, which is 2.8.8.2, what GROUP is it in?
2
4
1
3
16
Who discovered neutrons in 1932?
Chadwick
Schrodinger
Rutherford
Bohr
17
What determines the mass number of an element?
The number of electrons only.
The number of neutrons in the nucleus.
The number of protons only in the nucleus.
The number of protons and neutrons in the nucleus.
18
Which subatomic particle has no charge?
Neutron
Proton
Electron
19
Which model is the most widely accepted model of the atom?
Solar System model
Billiard ball model
Planetary model
Electron cloud model
20
Atoms are made up of
electrons, protons and neutrons.
protons, neutrons and mixtures.
electrons, protons and elements.
protons, clouds and neutrons.
21
The atomic radius increases as you move down a group because
the number of electrons increases.
the number of neutrons increases.
the number of protons increases.
the number of electrons decreases.
22
Based on the electron arrangement of calcium, which is 2.8.8.2, what's its PERIOD and how many SHELLS does it have?
1
2
3
4
23
Who discovered negatively charged particles in 1897?
Chadwick
Thomson
Rutherford
Bohr
24
Who discovered protons in 1911?
Rutherford
Thomson
Chadwick
Bohr
25
Who proposed that electrons orbit the nucleus at fixed energy levels in 1913?
Schrodinger
Thomson
Bohr
Dalton
26
Matter MUST have the following.
Mass and weight
Mass and volume
Volume and space
Mass and time
27
The atomic number of calcium is 20. How many protons does calcium have?
10
20
80
40
28
What was Thomson's model called?
The billiard ball model
The electron cloud model
The plum pudding model
The planetary model
29
Atomic radius increases down groups.
False
True
30
All matter is made up of
mixtures.
atoms.
compounds.
elements.
31
What is the electron arrangement or configuration of calcium if its atomic number is 20?
2.8.2
2.1
2.8.3.2
2.8.8.2
32
A scientific theory or model changes over time as new what becomes available?
evidence
laws
numbers
33
Who said that elements consist of indivisible small particles (atoms) and that atoms of the same element are identical?
Dalton
Chadwick
Thomson
Bohr
