Atomic Structure

Front

Look at this picture of Argon off the periodic table. Which of the following is true for this element?

Options:

18 protons

,

40 protons

,

22 protons

,

21.9 protons

Back

18 protons

Front

The atomic mass of an atom is equal to

Back

number of protons plus number of neutrons

Front

The mass of this particle is so small that it is not counted. Options: proton, electron, neutron, quark

Back

electron

Front

The charge of the nucleus of all atoms or ions

Back

positive

Front

The number of these determines which element an atom is: neutrons, electrons, protons.

Back

protons

Front

What is true about an atom?

Back

Atoms are mostly empty space

Front

In order for an atom to be neutral, what has to be true?

Back

The atom has the same number of protons and electrons

Front

How is the number of neutrons in the nucleus of an atom calculated?

Back

Subtract the number of p+ from the mass number

Front

An atom has 10 protons, 15 neutrons and 10 electrons. What is its mass number?

Back

25

Front

What is the atomic number of the atom pictured? Options: 9, 10, 18, 19

Back

9