The Table
This is the name for the horizontal rows on the periodic table.
Periods
Two or more atoms bonded together form this.
This major group of elements is shiny, malleable, and a good conductor of electricity.
Metals
Then central part of the atom contains protons and neutrons.
The number above the symbol on the periodic table represents this
atomic number
Elements in the same vertical column share this common feature.
Valence Electrons & Similar physical/chemical properties
Water (H₂O) is an example of this type of particle made of two or more atoms chemically combined.
Compound
These elements are poor conductors and often brittle when solid.
Nonmetals
This subatomic particle determines the identity of an element.
the proton
The symbol "O" represents this element.
Oxygen
This number increases by one for each element as you move left to right across a period.
atomic number
A molecule made of only one type of atom is called this
Element
These elements have properties of both metals and nonmetals.
metalloids
These negatively charged particles are found outside the nucleus in energy levels.
electrons
The element with 26 protons is known as this metal.
Iron (Fe)
This group contains the most reactive nonmetals, such as fluorine and chlorine
halogens - Group 17
The chemical formula NaCl is made of sodium and chlorine and is commonly known as this.
Table salt
Silicon is in this category of elements and is widely used in electronics.
metalloid
The mass number of an atom equals the total number of these two particles.
protons and neutrons
If an atom has 15 protons, this is the element.
phosphorus (P)
These elements, located in the far right column of the periodic table, are known for being unreactive
Noble gases
A chemical formula tells you which elements are in a compound and how many atoms of each are present. For the formula C₆H₁₂O₆, identify how many total atoms are in one molecule of the compound
24 atoms?
6 carbon + 12 hydrogen + 6 oxygen
True or False: metals can conduct electricity.
True
This term describes atoms of the same element that have different numbers of neutrons
isotopes
An atom with 12 protons, 12 electrons, and 12 neutrons has this atomic mass.
24 atomic mass or mass number