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Ninth Grade (Grade 9) Atomic Structure Questions

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Grade 9 Atomic Structure
Who discovered neutrons?
  1. Sir Rutherford
  2. Sir James Chadulick
  3. Artstotle
  4. Archimedes
Grade 9 Atomic Structure
What is a region in an atom where electrons are most likely to be found?
  1. isotopes
  2. ions
  3. orbitals
  4. protons
Grade 9 Atomic Structure
The smallest chemical unit of matter is a(n)                .
  1. molecule
  2. atom
  3. unit
  4. element
Grade 9 Atomic Structure
Which are 4 kinds of orbitals?
  1. s, p, d, f
  2. a, b, c, d
  3. f, a, g, h
Grade 9 Atomic Structure
What is the atomic mass of nitrogen?
  1. 7 u
  2. 14.0067 u
  3. 8 u
  4. 2 u
Grade 9 Atomic Structure
Protons have a                 charge.
  1. positive
  2. neutral
  3. negative
Grade 9 Atomic Structure
Carbon-14 is an unstable form of carbon that is slightly radioactive. What is the best explanation why this isotope of carbon is less stable than other forms of carbon?
  1. It has a different number of protons than other forms of carbon.
  2. It is missing electrons.
  3. It is a compound.
  4. It has a different number of neutrons than other forms of carbon.
  5. It does not occur naturally.
Grade 9 Atomic Structure
What is the central core of an atom called?
  1. hub
  2. neutron
  3. nucleus
Grade 9 Atomic Structure
The smallest unit of matter is called a(n)                .
  1. proton
  2. neutron
  3. atom
  4. molecule
Grade 9 Atomic Structure
Which particle in the nucleus of an atom has a neutral charge?
  1. carbon
  2. electron
  3. neutron
  4. proton
Grade 9 Atomic Structure
Which of the following are ions?
  1. Na+
  2. Cl
  3. Si
  4. Cl-
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