Each different element on the periodic table has a different number of protons. The number of protons determines the identity of the element. No two elements have the same number of protons. The atomic number of the element tells us the number of protons.

Question

Isotopes are atoms of the same element with the same number of protons and electrons, but different numbers of neutrons. Isotopes have the same atomic numbers but different mass numbers.

1. Atom B has 34 protons and 40 neutrons. Atom C has 34 protons and 42 neutrons.:

2. Atom E has 10 protons and 11 neutrons. Atom F has 9 protons and 11 neutrons.:

3. Atom 8p, 8n and Atom 9p, 10n

4. Atom 9p, 10n and 9p, 9n

5. Atom U has an atomic number of 5 and a mass number of 12. Atom T has an atomic number of 6 and a mass number of 12.

6. Atom R has an atomic number of 16 and a mass number of 32. Atom S has an atomic number of 16 and a mass number of 33.:

choose the correct answer

Answer 1

To determine which atoms correspond to isotopes and which correspond to different elements, we can analyze the given information about protons and neutrons.

1. Atom B (34 protons, 40 neutrons) and Atom C (34 protons, 42 neutrons): These atoms are isotopes of the same element (Selenium) because they have the same number of protons (34) but different numbers of neutrons (40 and 42).

2. Atom E (10 protons, 11 neutrons) and Atom F (9 protons, 11 neutrons): These are not isotopes. Atom E has 10 protons (Neon) and Atom F has 9 protons (Fluorine). They are different elements.

3. Atom 8p (8 protons, 8 neutrons) and Atom 9p (9 protons, 10 neutrons): These are not isotopes. Atom with 8 protons is Oxygen and the one with 9 protons is Fluorine. They are different elements.

4. Atom 9p (9 protons, 10 neutrons) and Atom 9p (9 protons, 9 neutrons): These are isotopes of the same element (Fluorine) because they have the same number of protons (9) but different numbers of neutrons (10 and 9).

5. Atom U (atomic number 5, mass number 12) and Atom T (atomic number 6, mass number 12): These are not isotopes since Atom U is Boron and Atom T is Carbon. Different elements.

6. Atom R (atomic number 16, mass number 32) and Atom S (atomic number 16, mass number 33): These are isotopes of the same element (Sulfur) because they have the same number of protons (16) but different mass numbers (32 and 33).

Summary of Isotopes:

• Atoms that are isotopes:
  • 1 (B and C),
  • 4 (9p with 10n and 9p with 9n),
  • 6 (R and S).

Summary of Different Elements:

• Atoms that are different elements:
  • 2 (E and F),
  • 3 (8p and 9p),
  • 5 (U and T).

Therefore, statements 1, 4, and 6 correspond to isotopes, while statements 2, 3, and 5 correspond to different elements.