The atom of an element X is represented as \(^y_z X\). The basic chemical properties of X depend on the value of
Y
Z
Y - Z
Z - Y
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Discussions (5)
The answer is (B) because The Modern Periodic Law states that the properties of the elements are the periodic function of their atomic numbers.
This implies that Z is the atomic number that the chemical properties of element X is dependent on.
Sayonara
The atom is written as:
Where:
Y = mass number (protons + neutrons)
Z = atomic number (number of protons = number of electrons in a neutral atom)
Key Idea:
The chemical properties of an element depend on:
number of electrons
especially valence electrons
And the number of electrons is determined by the atomic number (Z).
Why not the others?
Y (mass number) → includes neutrons, does NOT affect chemical behavior
Y − Z → number of neutrons (no effect on chemistry)
Z − Y → not meaningful here
Final Answer:
B. Z
