P.8.7

In the modern periodic table, which of the following describes elements with similar properties? (SC.8.P.8.6)

• They have similar atomic masses.

• They are located in the same group.

• They are located in the same period.

• They have the same number of protons.

Using a periodic table, determine which of the following pairs of elements would have the most similar properties: (SC.8.P.8.6)

• (H) Hydrogen and (He) Helium

• (N) Nitrogen and (Si) Silicon

• (Ca) Calcium and (Fe) Iron

• (Li) Lithium and (K) Potassium

Use this element from the periodic table to answer the question. (SC.8.P.8.6)

What is the atomic mass for silicon?

• 14.0

• 14.1

• 28.1

• 42.1

Which of the following comparisons correctly describes subatomic particles? (SC.8.P.8.7)

• An electron has a negative charge and a mass larger than the mass of a proton.

• A neutron has a negative charge and a mass smaller than the mass of a proton.

• A neutron has a neutral charge and a mass larger than the mass of an electron.

• A proton has a positive charge and a mass smaller than the mass of an electron.

Why is an atom considered electrically neutral?

• The number of protons equals the atomic number.

• The number of electrons equals the number of neutrons.

• The number of protons is the same as the number of electrons.

• The number of electromagnetics equals the number of proteins

A subatomic particle with a neutral charge is called

• a proton

• an isotope

• an electron

• a neutron

An atom with the same atomic number but a different mass number is called

• an ion

• an isotope

• an element

__________ are used to identify the element.

• Electrons

• Periodic Table

• Protons

• Neutrons

If you change the number of neutrons, you change the __________.

• charge

• mass

• identity

How many protons are in Carbon-14?

• 6

• 8

• 14

• 12