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Questions
Define the term of atomic number.
What is meant by the term atomic number
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Solution
Atomic number [Z]: “Is the number of protons in the nucleus of an atom.”
OR “Is the number of positive charges in the nucleus of its atom.”
OR “Is the number of electrons in the complete atom.”
Z = P = e
RELATED QUESTIONS
Explain the Atomic number with example.
What is variable valency? Name two elements having variable valency and state their valencies.
The atomic number and mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement?
Give reason
Actual atomic mass is greater than mass number.
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Carbon – \[\ce{^12_6C}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
Are isotopes atoms of the same element or different elements.
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
Do isotopes have the same atomic number or the same mass number?
Which of the following are true for an element?
- Atomic number = number of protons + number of electrons
- Mass number = number of protons + number of neutrons
- Atomic mass = number of protons = number of neutrons
- Atomic number = number of protons = number of electrons
Name the 3 sub-atomic particles of an atom.
Compare the charge and mass of protons and electrons.
