G6-Atoms and Ions

​Atoms and ions

Particles in an atom:

Protons are positively charged.

Neutrons are neutrally charged.

Electrons are negatively charged.

​The nucleus of an atom is made of protons and neutrons

Multiple Choice

Which is an electron?

• a

• b

• c

• both b and c

Multiple Choice

What is found in the nucleus of atoms?

• Protons and electrons.
• Protons, neutrons, and electrons.
• Protons and neutrons.
• Neutrons and electrons.

Multiple Choice

Protons are:

• Positive

• Neutral

• Negative

Multiple Choice

Neutrons are:

• Positive

• Neutral

• Negative

Overall Charge of an Atom = 0

• Remember: the charge of the NUCLEUS is going to be POSITIVE because of the PROTONS

• Remember: the charge of the ELECTRONS is going to be NEGATIVE

• number of Protons = number of Electrons

  + = -

​Helium atom

The atomic number in the periodic table is the proton number.

​How many protons and electrons does an oxygen atom have?

Multiple Choice

What is the atomic number?

• The number of protons in an element
• The number of neutrons in an element
• The number of protons plus neutrons.

• The number of protons plus electrons.

Multiple Choice

What is the overall charge of an ATOM?

• +1

• 0

• -1

Multiple Choice

Electrons are:

• Positive

• Neutral

• Negative

Electrons are arranged in shells

The 1st shell can hold 2 electrons.

The 2nd shell can hold 8 electrons.

The 3rd shell can hold 8 electrons. (Then fill the first 2 electrons of the 4th shell)

​How to draw an atom of sulfur?

Valence electrons are in the outermost shell and take part in chemical reactions.

​When an atom loses or gains valence electrons, it becomes an ion

Multiple Choice

How many valence electrons in this diagram:

• 1

• 3

• 5

• 7

Multiple Choice

How many electron shells are there in this diagram?

• 2

• 3

• 5

• 7

Multiple Choice

What would an atom change into after losing or gaining electrons?

• ion

• molecule

• element

• shell

Multiple Choice

Which one is a positive ion?

• F^-

• Cl_²

• O

• K⁺