Elements
This element has the symbol O and is what we breathe to stay alive.
What is oxygen?
This particle has a positive charge and is found in the nucleus.
What is a proton?
This is two or more atoms that are chemically bonded together.
What is a molecule?
This is the smallest unit of an element that still has the properties of that element.
What is an atom?
This chart shows all the known elements organized by atomic number.
What is the periodic table?
This element has the symbol H and is the lightest element on the periodic table.
What is hydrogen?
This particle has no charge and is also found in the nucleus.
What is a neutron?
This molecule is made of two hydrogen atoms and one oxygen atom.
What is water (H₂O)?
This is the center of an atom where protons and neutrons are found.
What is the nucleus?
The horizontal rows on the periodic table are called this
What are periods?
This element has the symbol Fe and is used to make steel.
What is iron?
This particle has a negative charge and moves around the outside of the nucleus.
What is an electron?
This gas molecule that we breathe out has one carbon atom and two oxygen atoms.
What is carbon dioxide (CO₂)?
These tiny particles move around the outside of the nucleus.
What are electrons?
The vertical columns on the periodic table are called this.
What are groups (or families)?
This element has the symbol Au and is a valuable yellow metal used in jewelry.
What is gold?
This is the center of an atom where protons and neutrons are found.
What is the nucleus?
This molecule has two oxygen atoms and is what we breathe to stay alive.
What is oxygen (O₂)?
This particle has a positive charge.
What is a proton?
This scientist made the first widely accepted periodic table.
Who is Dmitri Mendeleev?
This element has the symbol Na and is part of table salt.
What is sodium?
This number tells how many protons an element has
What is the atomic number?
This is the small letter or number in a chemical formula that tells how many atoms are in a molecule.
What is a subscript?
This particle has no charge
What is a neutron?
These elements are on the left side of the periodic table and are usually shiny and good conductors of heat and electricity
What are metals?