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The atomic number of an atom is equal to the:
total number of protons present in the nucleus of an atom
sum of the number of electrons and that of neutrons
half of the number of electrons present in the nucleus of an atom
sum of the number of protons and that of neutrons
total number of protons present in the nucleus of an atom
The atomic number of an element is defined as the total number of protons present in the nucleus of its atom. It is represented by the symbol Z and uniquely identifies a chemical element.
The atomic number of an element is defined as the total number of protons present in the nucleus of its atom. It is represented by the symbol Z and uniquely identifies a chemical element.
Think of the atomic number as the unique roll number or ID card number of a student in a school; no two different chemical elements can have the exact same number of protons.
PZA: Protons equals Z (Atomic number) equals Atom's identity.
Z=Number┬аof┬аprotons┬а(p)
A=Z+n тАФ Mass number equals atomic number plus neutrons
In a neutral atom, the atomic number (Z) is also equal to the total number of electrons orbiting the nucleus. However, the fundamental definition is based on the nuclear charge, which is determined solely by the number of protons.
Atomic number is denoted by the symbol Z.
It determines the chemical properties of an element and its position in the Modern Periodic Table.
Mass number (A) is the sum of protons and neutrons in the nucleus.
In a neutral atom, number of protons = number of electrons.
Provides a fundamental basis for classifying elements in the periodic table.
Directly correlates with the electronic configuration of elements.
Arrangement of elements in the Modern Periodic Table by increasing atomic number.
Identification of isotopes (same atomic number, different mass number).
Henry Moseley discovered the concept of atomic number in 1913 using X-ray spectra.
Option B refers to the mass number (A), not the atomic number.
A is correct тАФ The atomic number of an atom is equal to the total number of protons present in the nucleus of an atom.
Remember that chemical reactions involve valence electrons, but the chemical identity of an element is strictly governed by its atomic number (number of protons).
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