Atoms Flashcards

1
Q

What is the average radius of an atom?

A

0.1 nanometers (1x10-10m)

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2
Q

Give key parts and functions of an atoms nucleus-

A

The nucleus is in the middle of the atom and contains protons and neutrons. The nucleus has a radius of around 1 x 10-14m and has a positive charge due to the protons. it makes up almost the whole mass of the atom.

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3
Q

Give key functions of the electrons in an atom-

A

The electrons move around the nucleus in electron shells (levels). They are negatively charged and have almost no mass.

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4
Q

Where can you find the atomic number and mass number of an atom?

A

On its nuclear symbol.

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5
Q

What is the atomic number?

A

The number of protons the atom.

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6
Q

What is the mass number of an atom?

A

Number of protons + the number of neutrons

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7
Q

What is the number of neutrons?

A

The mass number- atomic number

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8
Q

What charge are atoms?

A

Atoms have no charge as the protons and electrons are always the same so they balance each other out.

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9
Q

What is an ion?

A

An ion is a group of atoms that has lost or gained electrons.

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10
Q

how do atoms make molecules?

A

they bond together to make molecules

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11
Q

how is the molecule H2O made?

A

2 hydrogen atoms bond with 1 oxygen atom

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12
Q

what is the difference between molecules and elements?

A

molecules are different types of atoms that have bonded together whereas elements are made up of one type of atom

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13
Q

what is the smallest type of atom?

A

hydrogen, which us made up of one proton in the nucleus and one in electron in the outside orbit

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