Question

question 1
the atoms of different elements have:
a the same atomic number but different atomic weights
b the same atomic number and same atomic weight
c different atomic numbers but the same number of electrons
d different atomic numbers

Explanation:

The atomic number is the number of protons in an atom's nucleus. Each element has a unique atomic number. For example, hydrogen has an atomic number of 1, and helium has an atomic number of 2. Different elements cannot have the same atomic number.

• Option A: Atoms of different elements have different atomic numbers. So, this option is incorrect.
• Option B: Different elements have different atomic numbers. So, this option is incorrect.
• Option C: Different elements have different atomic numbers. The number of electrons in a neutral atom is equal to the atomic number. So, different elements have different numbers of electrons. This option is incorrect.
• Option D: Since each element has a unique atomic number, atoms of different elements have different atomic numbers. This option is correct.

Answer:

D. different atomic numbers