Element Properties
Which element is the lightest and most abundant in the universe?
Hydrogen (H)
Which group on the periodic table contains the noble gases?
group 0
Who is credited with creating the modern periodic table?
Dmitri Mendeleev
What element is used to fill balloons because it is lighter than air?
Helium (He)
In which direction does atomic radius increase on the periodic table?
Down a group and from right to left across a period
Which element is a liquid at room temperature and is found in thermometers?
Mercury (Hg)
What is the name of the elements in Group 7?
Halogens
Which element, discovered by Marie Curie, is named after her homeland of Poland?
Polonium (Po)
What element is used in fluorescent lamps and neon signs?
Neon (Ne)
As you go down Group 7 (the halogens), does reactivity increase or decrease?
decrease
Which element is a gas and makes up about 78% of Earth’s atmosphere?
Nitrogen (N₂)
Which group is known as the alkali metals?
group 1
What element did Henry Cavendish discover in 1766, known for being the lightest gas?
Hydrogen (H)
What element is added to toothpaste to help prevent cavities?
Fluorine (F) (as fluoride)
What is the trend for atomic size as you move down a group in the periodic table?
increase
Which element is used in pencil “lead”?
Carbon (C) (as graphite)
Which group contains the alkaline earth metals?
group 2
What was the first element to be artificially created in a lab?
Technetium (Tc)
What element is commonly used in batteries, especially in rechargeable ones?
Lithium (Li)
Which element in Group 1 is the most reactive?
Francium (Fr)
Which element is the hardest naturally occurring substance?
Carbon (C) (as diamond)
How many periods are there in the periodic table?
7
What was the first element to be artificially created in a lab?
Technetium (Tc)
What element is used in thermometers because it remains liquid at room temperature?
Mercury (Hg)
As you move from left to right across a period, do elements tend to become more metallic or less metallic?
Less metallic