Chemistry- Elements (7th Grade Science)

Which property of bromine could you NOT predict based on the fact that it is a nonmetal in the halogen family?

• highly reactive

• poor conductor of heat

• liquid at room temperature

What information in the periodic table indicates the number of protons in an atom?

• the element's chemical symbol

• the element's atomic number

• the element's atomic mass

Fluorine, chlorine, bromine, and iodine are part of a family called

• noble gases

• halogens

• metalloids

Which of these statements about a column of the periodic table is true?

• The elements have similar properties.     

• The elements have a wide range of properties.       

• The elements have the same atomic mass.

The elements in a row of the periodic table

• are in the same family.

• have the same average atomic mass.

• have properties that change in a pattern.

In the periodic table, the most reactive metals are found

• in Group 1, the first column on the left.

• in Periods 6 and 7 at the bottom.

• in Period 1, the first row across the top.

What natural event provides enough energy for the nuclear fusion reactions that create the heaviest elements?

• a particle accelerator

• a supernova

• a nebula

Tags

NGSS.HS-ESS1-3

From an element's location in the periodic table, you can predict

• when it was discovered.

• its properties.

• its chemical symbol

The half-life of a radioactive isotope is the length of time needed for half the atoms of a sample to

• double in size.

• decay

• rust

Tags

NGSS.HS-PS1-8

To make most synthetic elements, scientists use powerful machines called

• particle accelerators.

• semiconductors.

• supernovae.