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Atom and some periodic table Flashcards | StudBud
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Atom and some periodic table
Atom and some periodic table
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# atom
Flashcards
18 cards
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Questions
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Answers
1
What is the charge of the neutrons?
positive
negative
neutral
2
If an atom has 10 protons and its mass is 24, how many neutrons are there?
10
12
14
24
3
What is the charge of electrons?
0
+
100
-
4
Why did Mendeleev leave spaces in his periodic table?
He anticipated that new elements would be found.
The spaces represent the neutrons.
The spaces represent the electron cloud.
He didn't know what he was doing.
5
What does atomic mass represent?
neutrons + protons
electrons
protons + electrons
6
What is the atomic number of Calcium?
20
41
40
10
7
How many elements are there now?
129
631
110
118
8
If an atom has a negative charge..
It has a lot of neutrons
It has more electrons than protons
It has an equal amount of protons and electrons
It has more protons than electrons
9
How many protons does fluorine have?
9
8
19
10
If an atom has a positive charge...
The atom has a lot of protons
The atom has more protons than electrons
The atom has more electrons than protons
The atom has equal amounts of neutrons and protons
11
What is the first element on the periodic table?
Oxygen
Hydrogen
Helium
Carbon
12
If you wanted to figure out the mass of an atom what would be the best way to do that?
Count the electrons
Add the protons and neutrons
Add the electrons and neutrons
13
What is the atomic number?
number of electrons
number of neutrons
number of protons
14
If an atom has 10 electrons, how many protons does it have? (if it is neutral)
20
15
5
10
15
What is the charge of the nucleus?
Neutral
Negative
Positive
Proton
16
How many neutrons does oxygen have?
8
16
32
17
What does it mean to be periodic?
repeating according to properties
alternating between properties
not repeating according to properties
18
How many elements were there in the time of Mendeleev?
63
50
10
118
