The Periodic Table Flashcards
What is an atomic number?
the number of protons in the nucleus of an element
What are elements?
substances that cannot be broken down into anything else.
What is a group and a period?
A group is a vertical column of elements. A period is a horizontal line of elements
What is the definition of atomic mass?
the mass of an atom in the element
What are isotopes?
atoms that have the same number of protons and electrons, but a different number of neutrons.
In what phase of matter are most elements found?
solids.
How many rows and columns are there?
7 rows, 18 columns
What is the table divided in?
Non-metals, metals, and metalloids
What are valence electrons?
The electrons farthest from the nucleus. Atoms have different numbers of valence electrons.
What is Reactivity?
How likely an atom is to react with other atoms.Some elements are very reactive, while others almost never react.
What are the groups?
Alkali metals, Alkali earth metals, Transition metals, Boron family, Carbon family, Nitrogen family, Oxygen family, Noble gases and the Halogens.
