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Periodic table Flashcards | StudBud
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Periodic table
Periodic table
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Answers
1
Which of the following elements has the greatest atomic mass?
Lead
Thorium
Uranium
Gold
2
Electrons are heavier than protons:
False
True
3
The isotope
14
C has how many neutrons?
14
6
20
8
4
What is the maximum number of electron shells for the first 20 elements
1
4
2
3
5
A Mg
2+
ion has how many electrons?
10
24
14
12
6
Al ions 3+charge and Cl ions 1- charge. What is the formula for aluminium chloride.
AlCl2
AlCl3
Al3Cl
7
A positively charged ion has:
Gained electrons
Gained protons and electrons
Gained protons
Lost electrons
8
An element is a substance which consists of:
atomswhich all have identical mass
atomswhich all have the same number of protons
atomswhich all have the same number of neutrons
atomsall of which are exactly the same
9
Group II elements have how many valence electrons?
5
1
2
6
10
Anion has 9 protons, 10 neutrons and 10 electrons. This ion is
F<span style="font-size: 13.3333px;">+1</span>
F<span style="font-size: 13.3333px;">-1</span>
Ne+2
O+2
11
The following are the atomic numbers of five different elements: 5, 9, 13, 16 and 18
Si,F, CI, B and Ar
AI,F,S, B and Ar
Si,N, S, C and CI
AI,Ne, CI, Be and K
12
What is the atomic mass of the isotope Strontium-90?
52
38
87.62
90
13
The number of electrons an atom has is always the same as the number of protons:
False
True
14
Each atom of the element magnesium has how many protons?
18
24
8
12
15
The atomic number, Z, is the same as the number of protons an atom has..
True
False
16
Each atom of the element carbon has how many protons?
12
6
18
8
