All - review - honors

Match the following

• Negative charge

• Protons

• No charge

• Electrons

• Positive charge

• Neutrons

Tags

NGSS.MS-PS1-1

Arrange the scientists in chronological order according to their discoveries about atoms

• Democritus

• Rutherford

• Dalton

• Thomson

• Bohr

Inside the nucleus, we have:

• Protons

• Neutrons

• Electrons

• Ions

• Isotopes

What statement(s) is/are true?

• Chemical symbol of elements can have more than one capital letter.

• Chemical symbol are unique.

• If a chemical symbol has two letters, they are the two first letters of its name.

• Some elements do not have chemical symbol.

Match the following

• Atomic number

• 87

• Element name

• Fr

• Atomic mass

• 223

• Chemical symbol

• Francium

Tags

NGSS.MS-PS1-1

Gold has ​ (a)   protons, ​ (b)   electrons and ​ (c)   neutrons.

• 79
• 118
• 119
• 80
• 0
• 276
• 275

Tags

NGSS.MS-PS1-1

Valence electrons are electrons

• in the closest orbital

• in the outermost orbital

• in any orbital

• in excess compared to the number of protons

• in the nucleus

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

In the picture, we have

• 1 valence electron

• 2 valence electrons

• 3 valence electrons

Tags

NGSS.MS-PS1-1

We can know with certainty where the electrons are located.

• False

• True

We can have different elements with the same atomic number

• False

• True

Answer explanation

Each element has a specific atomic number.