Atomic Structure and Chemical Bonding
ICSE · Class 9 · Chemistry
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What is the atomic number of an element?
What is the maximum number of electrons that can be accommodated in the L shell?
In the formation of NaCl, what happens to the sodium atom?
The electronic configuration of magnesium (atomic number 12) is:
Sample Questions
Which of the following particles are found in the nucleus of an atom?
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Protons, Neutrons
The nucleus contains protons (positively charged) and neutrons (neutral). Electrons revolve around the nucleus in orbits. Alpha particles are not fundamental particles of atoms.
Isotopes are atoms that have the same atomic number but different mass numbers.
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True
Isotopes are atoms of the same element with the same number of protons (same atomic number) but different number of neutrons (different mass numbers).
Which of the following statements about noble gases are correct?
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They have complete outermost electron shells, They are chemically inactive
Noble gases have complete outermost shells (8 electrons except helium which has 2) making them stable and chemically inactive. They don't readily form compounds.
What type of bond is formed between two non-metals?
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Covalent bond
When two non-metals combine, they share electrons to achieve stable configuration, forming covalent bonds. Ionic bonds form between metals and non-metals.
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