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ENERGY: Action of electricity on materials
ENERGY: Action of heat on materials
MATTER - PROPERTIES AND TRANSFORMATION: Chemical Reactions And Equations
MATTER - PROPERTIES AND TRANSFORMATION: Chemical Symbols, Formulae And Valency
MATTER - PROPERTIES AND TRANSFORMATION: Effect Of Heat On Substances
MATTER - PROPERTIES AND TRANSFORMATION: Introduction To Chemistry - Symbols
MATTER - PROPERTIES AND TRANSFORMATION: Mixtures And Pure Substances
MATTER - PROPERTIES AND TRANSFORMATION: Periodic table - Families of elements and Relative reactivity
MATTER - PROPERTIES AND TRANSFORMATION: Reaction With Oxygen of air
MATTER - PROPERTIES AND TRANSFORMATION: The Atom And Sub-Atomic Particles

Which particle in atoms is very important in the chemical combination of atoms?

Neutron.

Proton.

Electron.

Nucleus.

The atomic number of Magnesium (Mg) is 12. Its mass number is 24. How many neutrons does a neutral Magnesium atom contain?

36.

24.

12.

Which subatomic particle is responsible for the chemical properties of an atom?

Proton.

Neutron.

Nucleus.

Electron.

Which statement is a limitation of Bohr's atomic model?

It fails to account for the existence of isotopes.

It accurately explains the spectra of multi-electron atoms.

It does not explain why electrons don't spiral into the nucleus.

It correctly predicts the exact position of electrons.

The arrangement of electrons on shells is called?

Atomic number.

Electroscopy.

Electronic configuration.

Isotopy.