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Atoms: The Building Blocks of Matter Flashcards | StudBud
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Atoms: The Building Blocks of Matter
Atoms: The Building Blocks of Matter
21 terms
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A review of the history of the atom and the subatomic particles.
Flashcards
21 cards
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Questions
21
Answers
1
A carbon atom has a mass of 14, but it usually has a mass of 12 AMUs. Why did this happen?
It has one more proton
It has two more electrons
It has 2 more protons
It has 2 more neutrons
2
If the atomic number is 4 and the mass number is 9, how many neutrons in the atom?
4
2
3
5
3
What is this an atom of?
nitrogen
hydrogen
helium
beryllium
4
The number of electrons in a stable atom equals the number of
neutrons
quarks
protons
energy levels
5
In this model of an atom, the red circles are
electrons
quarks
protons
neutrons
6
The number of protons in the nucleus of an atom is called the
atomic mass
element number
mass number
atomic number
7
The first person to say that the atom is the smallest unit of matter
Aristotle
Dalton
Democritus
Bohr
8
The exact location of an electron in an electron cloud
is impossible to determine
depends on the amount of energy in the electron
depends on the mass of the electron
depends on the charge of the electron
9
The nucleus of the atom was first discovered by
Dalton
Thomson
Rutherford
Bohr
10
What did Aristotle say?
atoms were indivisible
atoms did not move
atoms could be cut into smaller pieces
matter was made of earth, air, water, and fire
11
In this model of the atom, the yellow dots are
neutrons
electrons
quarks
protons
12
The atomic number of magnesium is 12. Its nucleus must contain
6 protons and 6 neutrons
12 protons
6 protons and 6 electrons
12 neutrons and 6 protons
13
In this model of an atom, the green dots are
electrons
neutrons
protons
quarks
14
The positively charged part of the atom is known as the
quark
proton
neutron
electron
15
The negatively charged particle (electron) was discovered by
Bohr
J. J. Thomson
John Dalton
Ernest Rutherford
16
The sum of the protons and neutrons in the nucleus of the atom is called the
element number
atomic balance
atomic number
atomic mass
17
The theory of electrons in energy levels was first proposed by
Thomson
Dalton
Bohr
Rutherford
18
Electrons are kept in position around the nucleus of an atom thanks to
strong force
electromagnetic force
gravity
weak force
19
The nucleus of the atom contains
electrons and neutrons
protons and neutrons
neutrons only
protons and electrons
20
Rutherford's experiments showed that
electrons are located on the outside of the nucleus
atoms possess a small, positively charged nucleus
atoms are mostly empty space
ALL of these!
21
According to J.J. Thomson's model of the atom...
atoms are small, hard particles like a pool ball
atoms are like planets around the sun
atoms contain electrons revolving around a nucleus
atoms are made of negatively charged particles in "pudding"
