Atoms
What is an atom?
the smallest piece of matter to be considered an element
What is a covalent bond?
bond where atoms share electrons
How do you determine which elements are in the same group on the periodic table?
same vertical column
What is the pH scale?
scale used to determine the concentrations of acids and bases in a solution
Where are electrons located?
in shells/orbitals outside the nucleus
Which subatomic particle has a negative charge?
electron
What is an ionic bond?
bond formed when a positively charged ion an a negatively charged ion attract
How do you determine which elements on the periodic table are in the same period?
same horizontal row
True or False - A neutral solution is not acidic or basic?
true
What is an ion?
an atom that has gained or lost electrons
What is the charge of a proton?
positive
This forms when two or more atoms bond together.
molecule
What are symbols on the periodic table?
abbreviations for the names of elements
What is a synthesis reaction?
a reaction where smaller molecules combine to form a larger molecule
What is a chemical formula?
Uses symbols and numbers to show the elements and their quantities present in a molecule
Which subatomic particle does not have a charge?
neutron
This forms when two or more atoms from different elements are bonded together.
compound
What determines an element's atomic mass?
number of protons + number of neutrons
What is a decomposition reaction?
a reaction where larger compounds break into smaller compounds
What feature of an atom's outer shell makes the atom stable?
a full shell (8 valence electrons)
What is located in the nucleus?
protons and neutrons
What is a chemical change?
atoms combine to form new substances
What determines an element's atomic number?
Who developed the periodic table?
Mendeleev
If a neutral atom of oxygen has 8 protons, how many electrons does it have and how do you know?
8, neutral atoms have equal numbers of protons and electrons.