Meet the Elements
This element has the chemical symbol O and is needed for respiration.
oxygen?
Horizontal rows on the periodic table are called these.
Periods
The centre of an atom is called the ______.
Nucleus
A substance made of only one type of atom is called this.
Element
This gas makes up most of Earth's atmosphere.
Nitrogen
This element with the symbol Au is often used in jewellery.
Gold
Vertical columns on the periodic table are called these.
Groups (families)
This particle has a positive charge.
Proton
A substance made when two or more elements are chemically joined is called this.
Compound
This element is commonly used in electrical wiring because it conducts electricity well.
Copper
This element has the symbol Na and is found in table salt.
Sodium
Elements in the same group tend to have similar ______.
Properties
This particle has no charge.
Neutron
A student finds an atom with 17 protons. Using the periodic table, identify the element.
Chlorine
This element is found in the "lead" of a pencil.
Carbon (graphite)
This element has the symbol Fe and is used to make steel.
Iron
Most elements on the left side of the periodic table belong to this category.
Metals
This particle moves around the nucleus.
Electron
Carbon dioxide contains carbon and this other element.
Oxygen
This element is added to balloons so they float safely.
Helium
This element is the lightest element on the periodic table.
Hydrogen
This number tells you how many protons an atom has.
Atomic number?
An atom with 8 protons must be this element
Oxygen
The compound NaCl is commonly known as this.
Table salt
This element is essential for strong bones and teeth.
Calcium