The nucleus of an atom is

positively charged w/ high density

The number of neutrons in the nucleus of an atom can be calculated by

subtracting protons from the mass number

Which of the statements is NOT true

Atoms of isotopes of an element have different # of protons

How do the isotopes of hydrogen-2 and hydrogen-3 differ?

H-3 has one more neurtron than H-2

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Chapter 4 Review

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Answers

1
The nucleus of an atom is
positively charged w/ high density
positively charged w/ low density
negatively charged w/ high density
negatively charged w/ low density
2
The number of neutrons in the nucleus of an atom can be calculated by
adding the mass number to protons
Subtracting protons from electrons
Adding electrons and protons
subtracting protons from the mass number
3
Dalton thought atoms are indivisible and atoms of an element are identical. We now know that
Dalton was completely correct
all atoms of an element are not identical but have same mass
atoms of an element can have a different # of protons
atoms are all divisible
4
An atom with atomic number 48 and a mass number of 120 contains
72 p+, 72 e-, 48 n0
48 p+, 48 e-, 72 n0
72 p+, 48 e-, 48 n0
120 p+, 48 e-, 72 n0
5
Which of the following is not a part of Dalton's atomic theory?
Atoms of the same element are alike
Atoms are always in motion
Atoms combine in simple whole number ratios
All elements are composed of atoms
6
Which of the statements is NOT true
The nucleus of an atom has a positive charge
Atoms of isotopes of an element have different # of protons
atoms of the same elements can have different masses
Atoms are mostly empty space
7
Relative atomic masses are measured in
angstroms
nanograms
amus
grams
8
The sum of the protons and neutrons in an atom equals
number of electrons
atomic mass
atomic number
mass number
9
The number 80 in the name bromine-80 represents
the atomic number
the mass number
none of the above
the sum of protons and electrons
10
Which of these statements is FALSE
the neutron is found in the nucleus
the nucleus of an atom is positively charged
electrons have a negative charge
electrons have mass of 1 amu
11
How do the isotopes of hydrogen-2 and hydrogen-3 differ?
H-2 has no protons
H-2 has three protons
H-3 has two neutrons
H-3 has one more neurtron than H-2

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