Atomic Structure

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

• 18 protons

• 40 protons

• 22 protons

• 21.9 protons

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

The atomic mass of an atom is equal to

• number of protons plus number of neutrons

• number of protons plus number of electrons

• number of electrons plus the number of neutrons

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NGSS.MS-PS1-1

The mass of this particle is so small that it is not counted.

• proton
• electron
• neutron
• quark

The charge of the nucleus of all atoms or ions

• positive
• negative
• neutral
• sometimes positive and sometimes negative

The number of these determines which element an atom is.

• neutrons
• electrons
• protons

What is true about an atom?

• Most of the space in an atom is taken up by the nucleus
• Atoms are mostly empty space
• Atoms have no mass
• Electrons have much more mass that protons or neutrons.

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NGSS.HS-PS1-7

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

• The atom has more protons than neutrons
• The atom has more neutrons than protons
• The atom has the same number of protons and neutrons
• The atom has the same number of protons and electrons

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

• Add the number of e- and p+ together
• Subtract the number of e- from p+
• Subtract the number of p+ from the mass number
• Add the mass number to the number of e-

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

• 20

• 10

• 35

• 25

What is the atomic number of the atom pictured? 

• 9
• 10
• 18
• 19

Tags

NGSS.MS-PS1-1