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- 1. Multiple-choice30 seconds1 pt
A positively charged particle found in the nucleus is called a
neutron.
proton.
electron.
positron.
- 2. Multiple-choice30 seconds1 pt
Electrons are subatomic particles that exist
inside the nucleus.
in simultaneous dimensions.
in parallel universes.
outside the nucleus.
- 3. Multiple-choice30 seconds1 pt
Neutrons have almost exactly the same mass as
electrons.
positrons.
protons.
quarks.
- 4. Multiple-choice30 seconds1 pt
Because atoms are neutral, each positive charge is
the same as a neutral charge.
balanced by a negative charge.
the same as no charge.
balanced by a neutral charge.
- 5. Multiple-choice30 seconds1 pt
Which statement best describes the mass number (#) of an atom?
the sum of electrons and neutrons in the nucleus
the sum of protons & neutrons in the nucleus
the difference in mass between protons & neutrons
the difference in mass between electrons and neutrons
- 6. Multiple-choice30 seconds1 pt
Every neutral atom has the same number of protons and electrons, however
they may not have the same # of neutrons.
they cannot combine with other atoms.
they cannot form isotopes.
they may also have the same atomic mass.
- 7. Multiple-choice30 seconds1 pt
When an atom contains more electrons than protons, it is
a neutral atom with no charge
an ion and negatively charged
an ion and positively charged
an isotope and has more mass
- 8. Multiple-choice30 seconds1 pt
If a carbon atom has six protons and has a mass of 13 amu, how many neutrons are in that carbon atom?
5
6
7
8
- 9. Multiple-choice30 seconds1 pt
A certain atom has 26 protons, 26 electrons, and 30 neutrons. What is its mass number?
26
30
52
56
- 10. Multiple-choice30 seconds1 pt
What is the nucleon number of sodium?
11
23
12
- 11. Multiple-choice30 seconds1 pt
What is the neutron number of the sodium atom?
23
12
11
22
- 12. Multiple-choice30 seconds1 pt
The atom has 24 atomic mass and 14 neutrons. How many electron does it have.
24
10
14
12
- 13. Multiple-choice30 seconds1 pt
Which of the following statements is incorrect about the structure of an atom?
i. The whole mass of an atom is concentrated in the nucleus
ii. The atom is an indivisible particle
iii. The atom as a whole is neutral
iv. All the atoms are stable in their basic state
Choose the right option among the following:
(i) and (iii)
only (ii)
(ii) and (iv)
none of these
- 14. Multiple-choice30 seconds1 pt
An element has 5 valence electron , what is its valency?
4
3
2
1
- 15. Multiple-choice30 seconds1 pt
An atom has four shells and 19 protons in its atom , what is its valency?
1
2
3
4
- 16. Multiple-choice30 seconds1 pt
Which of following has valency 2?
- 17. Fill-in-the-Blank30 seconds1 pt
An element having valency 3 may have valence electron...... or.......
- 18. Multiple-choice30 seconds1 pt
How many valence electrons are there in Nitrogen?
7
5
6
- 19. Multiple-choice30 seconds1 pt
If an electron is removed, an ion becomes
An atom
Positive
Negative
Neutral
- 20. Multiple-choice30 seconds1 ptHow many valence electrons are in an atom of Ar?2841
