Elements around us
What gas do we breathe that is essential for life
Oxygen
What does the periodic table show
all the known elements
What is the center of an atom called?
Nucleus
What is the name of the table that organizes all known elements
periodic table
What two elements make up water
hydrogen and oxygen
What element is found in cans and is used for packaging or in foil.
aluminum
What are the three main states of matter
solid, liquid, and gas
What are the three main parts of an atom?
protons, neutrons, and electrons
True or False: Helium is used in balloons
True
What is the symbol for oxygen?
O
What is the chemical formula for water?
H₂O
In which state of matter do particles move freely and are spread out
Gas
What charge does an electron have
negative
True or False: Helium is heavier than air
False
What is the first element on the periodic table
Hydrogen
Which gas do plants use for photosynthesis?
carbon dioxide
What state of matter can change shapes but not the volume of itself
Liquid
What part of the atom has a positive charge
Proton
What do plants produce during photosynthesis that is essential for animals and humans
Oxygen
How many elements are in the periodic table
118
What element makes up most of the Earth's atmosphere
nitrogen
What do the 2 set numbers on each element in a periodic table represent?
atomic number and atomic mass number
What part of the atom contributes to its atomic mass
Protons and Neutrons
What element in the periodic table are naturally magnetic
Iron, cobalt, Nickel
What do we call a substance that cannot be broken down into simpler substances
an element