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Search Results for isotopes - All Grades

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Grade 7 Atomic Structure
College Nuclear Chemistry
Isotopes have:
  1. The same number of neutrons
  2. A different number of neutrons
  3. A different number protons
  4. A different number of electrons
Grade 7 Atomic Structure
An isotope of carbon is                .
  1. boron-12
  2. nitrogen-12
  3. carbon-14
  4. hydrogen-2
Grade 10 Matter
Identify the isotopes in the figure.
  1. A and C
  2. B and C
  3. A, B, and D
  4. A, B, C and D
Grade 8 Atomic Structure
Grade 10 Atomic Structure

This question is a part of a group with common instructions. View group »

An element has an atomic number of 26 and has isotopes with mass numbers of 56 and 54. Its average atomic mass is 55.845 amu. Based on the average atomic mass, which of the following isotopes is most abundant?
  1. The isotope with a mass number of 54
  2. The isotope with a mass number of 56
  3. Both isotopes have equal abundances
  4. An isotope with a mass number other than 56 or 54
Grade 9 Periodic Table and Elements
Isotopes are atoms of an element
  1. with the same number of electrons but different numbers of protons.
  2. that are radioactive.
  3. with a magnetic charge.
  4. with the same number of protons but different number of neutrons.
Grade 10 Atomic Structure
An element has an atomic mass of 355.5 amu. Its isotopes have mass numbers of 355 and 356. Which statement is true about the isotopes of the element?
  1. The isotope with a mass number of 355 is more abundant.
  2. The isotope with a mass number of 356 is more abundant.
  3. The isotopes have an equivalent abundance.
  4. An isotope with a mass number of 357 is more abundant.
Grade 10 Atomic Structure
Which statement describes isotopes?
  1. Isotopes of the same element have different electron arrangements.
  2. Isotopes of the same element have different nuclear charges.
  3. Isotopes of the same element have nuclei with masses that are the same.
  4. Isotopes of the same element have the same number of protons
Grade 9 Atomic Structure
What is the central core of an atom called?
  1. electron
  2. isotope
  3. nucleus
  4. proton
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