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Stoichiometry - Engineering

Q1:

Atomic __________ of an element is a whole number.

A weight

B number

C volume

D radius

ANS:B - number

Atomic number:

  • The atomic number of an element is a fundamental property denoted by the symbol 𝑍Z.
  • It represents the number of protons found in the nucleus of an atom of that element.
  • It uniquely identifies each element in the periodic table.
  • Since atoms are electrically neutral, the atomic number also represents the number of electrons surrounding the nucleus in a neutral atom.
  • The atomic number determines the chemical properties of an element and its position in the periodic table.
  • The atomic number is always a whole number because protons cannot be divided; they are fundamental particles with a charge of +1+1.
For example:
  • Hydrogen (𝐻H) has an atomic number of 1, indicating it has one proton in its nucleus.
  • Carbon (𝐶C) has an atomic number of 6, meaning it has six protons in its nucleus.
  • Oxygen (𝑂O) has an atomic number of 8, indicating it has eight protons in its nucleus.
In summary, "number" in the context of atoms generally refers to the atomic number, which is a whole number representing the number of protons in the nucleus of an atom.