What is the atomic number and the mass number of an atom with 11 protons and 12 neutrons

atomic number = 11 and mass number = 23

The nucleus of an atom is

positively charged and has a high density

The identity of an element can be determined on the basis of which of the following

the number of protons in an atom of the element

Isotopes of the same element have

the same no. of protons but diff. no. of neutrons

The 1803 Dalton model of the atom

is an indivisible particle whose structure was unknown

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

subtracting the number of protons from the mass number

In order to calculate average atomic mass, one needs to know

the atomic mass and the relative abundance of each isotope

An atom of hydrogen-2 contains

1 proton, 1 electron, and 1 neutron

Which of the following correctly lists the particles ordered from least massive to most massive

electron, proton, hydrogen atom, helium atom

Which of these statements is NOT true?

Atoms of isotopes of an element have diff. no. of protons

Which of the following is NOT consistent with the results obtained in the Rutherford experiment

Electrons are contained in the nucleus of an atom

An atom of an element with atomic number 48 and mass number 120 contains

48 protons, 48 electrons, and 72 neutrons

The 1911 Rutherford model of the atom is composed of

a dense, positively charged nucleus with orbiting electrons

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Chemistry Ch 4 Wilbraham

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A review of Ch 4 Atomic Structure, Prentice Hall Chemistry, Wilbraham et.al.

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Questions 25

Answers

1
What is the atomic number and the mass number of an atom with 11 protons and 12 neutrons
atomic number = 11 and mass number = 12
atomic number = 12 and mass number = 11
atomic number = 23 and mass number = 12
atomic number = 11 and mass number = 23
2
Which of these statements is false?
The neutron is found in the nucleus of an atom
Electrons have a negative charge
The nucleus of an atom is positively charged
Electrons have a mass of 1 amu
3
How do the isotopes hydrogen-2 and hydrogen-3 differ?
Hydrogen-2 has no protons
Hydrogen-3 has two neutrons
Hydrogen-3 has one more electron than hydrogen-2
Hydrogen-2 has three protons
4
The nucleus of an atom is
positively charged and has a low density
negatively charged and has a high density
negatively charged and has a low density
positively charged and has a high density
5
All atoms of the same element have the same
mass
mass number
number of neutrons
number of protons
6
The identity of an element can be determined on the basis of which of the following
the atomic mass of the element
the mass number of the element
the number of neutrons in an atom of the element
the number of protons in an atom of the element
7
Isotopes of the same element have
the same no. of neutrons but diff. no. of protons
the same no. of protons but diff. no. of electrons
the same no. of protons but diff. no. of neutrons
the same no. of neutrons but diff. no. of electrons
8
The 1803 Dalton model of the atom
is composed of protons and electrons only
is an indivisible particle made up of protons only
is composed of protons only
is an indivisible particle whose structure was unknown
9
The number of neutrons in the nucleus of an atom can be calculated by
adding the mass number to the number of protons
adding together the numbers of electrons and protons
subtracting the no. of protons from the no. of electrons
subtracting the number of protons from the mass number
10
Which of the following is NOT a part of Dalton's atomic theory?
All elements are composed of atoms
Atoms are always in motion
Atoms that combine do so in simple whole-number ratios
Atoms of the same element are alike
11
In order to calculate average atomic mass, one needs to know
the mass number and the relative abundance of each isotope
the atomic number and the relative abundance of each isotope
the atomic mass and the relative abundance of each isotope
the atomic mass and the no. of neutrons
12
Oxygen has 3 isotopes: O-16, O-17, O-18. The atomic mass is 15.9994. The most abundant is
Oxygen-15
Oxygen-16
Oxygen-18
Oxygen-17
13
the symbol for an isotope of argon (Z=18) is ³⁶Ar. How many neutrons does the atom have?
19 neutrons
18 neutrons
36 neutrons
17 neutrons
14
An atom of hydrogen-2 contains
1 proton, 1 electron, and 2 neutrons
1 proton, 1 electron, and 1 neutron
2 protons, 2 electrons, and 4 neutrons
2 protons, 2 electrons, and 2 neutrons
15
Relative atomic masses are measured in
atomic mass units
electron mass units
nanograms
picograms
16
The sum of the protons and neutrons in an atom equals the
atomic mass
atomic number
number of electrons
mass number
17
The symbol for a zinc isotope is ⁵¹Zn. The number 51 represents
the number of electrons
the number of neutrons
the atomic number
the mass number
18
Which of the following correctly lists the particles ordered from least massive to most massive
electron, proton, hydrogen atom, helium atom
hydrogen atom, electron, helium atom, proton
proton, helium atom, hydrogen atom, electron
proton, electron, hydrogen atom, helium atom
19
Which of these statements is NOT true?
Atoms of the same element can have different masses
The nucleus of an atom has a positive charge
Atoms are mostly empty space
Atoms of isotopes of an element have diff. no. of protons
20
Which of the following is NOT consistent with the results obtained in the Rutherford experiment
The nucleus of an atom is positively charged
Atoms are composed mainly of empty space
Electrons are contained in the nucleus of an atom
The nucleus of an atom contains most of the mass of the atom
21
An atom of an element with atomic number 48 and mass number 120 contains
48 protons, 48 electrons, and 72 neutrons
72 protons, 72 electrons, and 48 neutrons
120 protons, 48 electrons, and 72 neutrons
72 protons, 48 electrons, and 48 neutrons
22
The number 80 in the name bromine-80 represents
the atomic number
none of these choices
the sum of protons and electrons
the mass number
23
The 1904 Thomson model of the atom is commonly called
the plum pudding model
the fruit cake model
the rum cake model
the vanilla pudding model
24
Which of the following statements is correct?
Protons are negatively charged
Atoms are positively charged
Electrons are positively charged
Neutrons have no charge
25
The 1911 Rutherford model of the atom is composed of
an indivisible particle of matter
a dense, neutrally charged nucleus with no electrons
a diffuse positively charged mass with embedded electrons
a dense, positively charged nucleus with orbiting electrons

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