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The Atom 8
Test Description: Chemistry atom
Instructions: Answer all questions to get your test result.
1) For an atom X(Z,A)A is the:
A
Mass number
B
Electrons Number
C
Atomic number
D
Protons number
2) In the argon atom,Ar (Z=18, A=40)the number of neutrons is:
A
22
B
18
C
40
D
58
3) In the calcium atom,Ca(Z=20, A=40) there are
A
20 protons, 20 electrons and 60 neutrons
B
20 protons, 40 electrons and 20 neutrons
C
20 protons, 40 electrons and 40 neutrons
D
20 protons, 20 electrons and 20 neutrons
4) The nuclear charge of the tritium atom,H(Z=1, A=1) is
A
4+
B
3+
C
1+
D
2+
5) The three atoms protium, H(Z=1, A=1), deuteriumH(Z=1, A=2) and tritium H(Z=1, A=3)are:
A
All of the choices.
B
Atoms of the same element.
C
Atoms with same number of electrons.
D
Isotopes
6) Neutrons are:
A
Neutral particles.
B
Determined by N = A – Z.
C
Found in the nucleus.
D
All of the choices.
7) The two atomsX(Z=18, A=40) and Y(Z=20, A=40) are:
A
Isotopes.
B
Atoms of the same element.
C
Allotropes.
D
Atoms of different elements.
8) When an atom loses electrons it forms:
A
A negatively charged ion.
B
None of the choices
C
A positively charged ion.
D
An anion.
9) The larger the atomic number (Z) the larger is the:
A
Atomic number
B
Number of neutrons
C
Number of electrons.
D
All of the choices.
10) The charge of an electron cloud is equal to:
A
Charge of nucleus.
B
Number of protons × relative charge of a proton.
C
Number of electrons × relative charge of an electron.
D
Number of neutrons × relative charge of a neutron.
*select an answer for all questions
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