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Atomic Structure
Test Description: Atomic structure day 1
Instructions: Answer all questions to get your test result.
1) Which of the following has a positive charge?
A
anion
B
electron
C
proton
D
neutron
2) Consider the species 72Zn, 75As and 74Ge. These species have
A
the same number of neutrons.
B
the same number of electrons.
C
the same number of protons.
D
the same mass number.
3) The neutral atoms of all of the isotopes of the same element have
A
equal numbers of neutrons.
B
the same number of electrons
C
the same masses.
D
different numbers of protons.
4) An atom of sodium has an atomic number of 11 and a mass number of 23. Which of the following statements is correct?
A
An atom of sodium has 11 protons, 12 electrons, and 11 neutrons.
B
An atom of sodium has 11 protons, 11 electrons, and 12 neutrons.
C
An atom of sodium has 11 protons, 11 electrons, and 11 neutrons.
D
An atom of sodium has 11 protons, 12 electrons, and 12 neutrons.
5) An atom of phosphorus has an atomic number of 15 and a mass number of 31. How many neutrons does it contain?
A
16
B
31
C
20
D
15
6) What is the chemical symbol for magnesium?
A
M
B
Mn
C
Ma
D
Mg
7) The mass of a single atom of a particular isotope is called which of the following?
A
Its relative atomic mass
B
Its atomic mass
C
Its atomic number
D
Its atomic weight
8) The identity of a chemical element is determined by which of the following?
A
The number of electrons it possesses
B
The number of protons it possesses
C
The number of neutrons it possesses
D
The sum of the number of protons and neutrons it possesses
9) Complete the following sentence: 'Different isotopes of the same element have...'
A
...the same number of protons, but differing numbers of neutrons and electrons
B
...the same number of protons and electrons, but differing numbers of neutrons
C
...the same number of neutrons, but differing numbers of protons and electrons
D
...the same number of protons and neutrons, but differing numbers of electrons
10) what is the atomic number of Nitrogen
A
28
B
15
C
7
D
4
*select an answer for all questions
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