An atom of Beryllium isotope has in its nucleus

Question

BlackTom AI · Accepted Answer

The nuclear notation ^9_4Be indicates mass number A = 9 (superscript) and atomic number Z = 4 (subscript). Atomic number (Z) equals the number of protons; mass number (A) equals total nucleons (protons + neutrons).

1. Relevant concepts:
- Atomic number Z = number of protons (defines the element).
- Mass number A = protons + neutrons.
- Number of neutrons = A − Z.

2. Step-by-step reasoning:
- From the notation ^9_4Be, read Z = 4 and A = 9.
- Protons = Z = 4.
- Neutrons = A − Z = 9 − 4.

3. Calculation (all intermediate steps):
- A = 9
- Z = 4
- Neutrons = 9 − 4 = 5

4. Why the correct answer is correct:
Because the nucleus contains 4 protons (atomic number 4, beryllium) and 5 neutrons (mass 9 minus 4 protons = 5 neutrons). This matches option f: "4 protons and 5 neutrons."

5. Why the other options are incorrect:
- a. "4 protons only" ignores neutrons; mass number 9 requires neutrons.
- b. "5 protons and 4 neutrons" reverses counts; 5 protons would be element boron (Z = 5), not beryllium.
- c. "4 protons and 9 neutrons" would give A = 13 (4 + 9), not the given A = 9.
- d. "4 protons and 4 neutrons" would give A = 8, corresponding to ^8Be, not ^9Be.
- e. "4 neutrons only" omits protons entirely; an element must have protons—Be has 4 protons.

6. Conclusion:
Therefore, the nucleus of ^9_4Be contains 4 protons and 5 neutrons, confirming the correct choice f.

An atom of Beryllium isotope has in its nucleus单项选择题

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