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Atomic Theory
Atomic Theory
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1
To determine the charge of an atom, one must know
the number of protons.
the number of electrons.
the number of protons and electrons.
the number of protons and neutrons.
2
Given the illustration of an atom, the mass number is
3
7
10
4
3
Elements are arranged in the periodic table according to increasing
size
atomic mass
reactivity
atomic number
4
Which element is a metalloid?
aluminum
sodium
arsenic
carbon
5
Chlorine-37 contains
37 neutrons
37 electrons
37 protons
20 neutrons
6
What is the total charge of a potassium nucleus?
+19
0
+39
+1
7
Rutherford's gold foil experiment confirmed the presence of
the proton
the electron
the nucleus
the atom
8
Which atomic theory places electrons in orbitals located outside of the nucleus?
Wave-Mechanical Theory
Dalton's Theory
Rutherford's Theory
Bohr's Theory
9
An atom of calcium has a mass of 40 amu. How many total protons and neutrons are there?
0
40
18
20
10
Experiments with cathode ray tubes confirmed the presence of
nuetrons
a nucleus
electrons
protons
11
Which subatomic particle has essentially no mass?
nucleus
electron
neutron
proton
12
The wave-mechanical model of the atom is needed to explain
spectra of elements with multi-electron atoms.
the mass number of an atom.
organization of atoms in a crystal.
radioactivity of elements.
13
Atoms with the same number of protons, but different numbers of neutrons are called
metals
isotopes
twins
isomers
14
The most common isotope of magnesium is most likely
magnesium-+2
magnesium-24
magnesium-10
magnesium-12
15
Which particles are contained in the nucleus?
protons and neutrons
electrons
neutrons
protons
