History of atom and its structure

Who is credited with the discovery of the atom?

• Democritus

• Albert Einstein

• Isaac Newton

• Marie Curie

What is the name of the model that describes the atom as a small, positively charged nucleus surrounded by electrons?

• Rutherford model

• Dalton model

• Thomson model

• Bohr model

What are isotopes?

• Atoms with the same number of protons and electrons

• Atoms of the same element with different numbers of neutrons

• Radioactive particles found in the atmosphere

• Different types of elements found in nature

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How do isotopes of an element differ from each other?

• Atomic mass

• Number of electrons in their nuclei

• Number of protons in their nuclei

• Number of neutrons in their nuclei

What are ions?

• Atoms or molecules that have gained or lost one or more electrons

• Elements with a high atomic mass

• Substances that cannot conduct electricity

• Small particles found in the nucleus of an atom

How are ions formed?

• When an atom gains or loses neutrons

• When an atom combines with another atom

• When an atom gains or loses electrons

• When an atom gains or loses protons

How do you calculate the atomic mass of an element?

• By counting the number of protons and neutrons in the nucleus

• By taking the weighted average of the masses of all the naturally occurring isotopes of that element.

• By multiplying the atomic number by the atomic weight of the element

• By adding the number of protons and electrons in the atom

What is the formula for calculating the atomic mass of an element?

• Dividing the number of neutrons by the number of protons

• Multiplying the number of electrons by the number of protons

• Subtracting the number of electrons from the number of protons

• Adding the number of protons and neutrons in the nucleus

What is the name of the model that describes the atom as a small, positively charged nucleus surrounded by electrons?

• Rutherford model

• Dalton model

• Thomson model

• Bohr model

How are ions formed?

• When an atom gains or loses neutrons

• When an atom combines with another atom

• When an atom gains or loses electrons

• When an atom gains or loses protons

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