Chemistry

Which pair of elements has the most similar properties?

• Li and B
• I and Ca
• K and He
• N and P

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which statement best explains how periods on the periodic table are organized?

• increasing atomic number from left to right
• increasing number of neutrons from left to right
• decreasing number of electrons from left to right
• decreasing atomic mass number from left to right

Where are the most reactive metals located on the periodic table?

• the uppermost complete row of the table
• the rows at the bottom of the table connecting two section
• the column at the far left side of the table
• the second column from the right side of the table

Sodium reacts with water. Which element is most likely to have a similar effect to sodium if it is exposed to water?

• carbon
• oxygen
• lithium

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which elements are most likely to react in the same manner in a chemical reaction?

• elements in the same group
• elements in the same period
• elements with similar atomic masses

Tags

NGSS.HS-PS1-2

If an element has no electrons to share and is stable, what family is it found in?

• alkali metals
• noble gases
• halogens

Why are certain elements placed into the same column on the periodic table?

• They have the same number of protons in their nuclei.
• They have the same number of electrons in their nuclei.
• They have the same number of electrons in their outer energy level.

Which property is unique for each element?

• mass number
• atomic number
• state of matter

Which subatomic particles determine the reactivity of groups of elements in the periodic table?

• electrons
• neutrons
• protons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Where on the periodic table are you most likely to find elements that do not react with other elements?

• group 1
• group 17
• group 18