Atoms & elements
what is the definition of an atom
the basic unit of a chemical element.
Explain the importance of a periodic table
to quickly refer to information about an element, like atomic mass and chemical symbol.
The definition of a chemical change
A chemical change happens when one chemical substance is transformed into one or more different substances
The definition of a physical change
usually reversible change in the physical properties of a substance, as size or shape
The importance of chemical measurements
what is the difference between an element and a compound?
An element is a pure substance made up only one type of atom, while a compound is made up of two or more different types of atoms chemically bonded together
what is the symbol for oxygen on the periodic table?
The symbol for oxygen on the table is O
How many protons, neutrons, and electrons are in a carbon atom?
A carbon atom has 6 protons, 6 neutrons, 6 electrons
Which element is located between magnesium (mg) and chlorine on the periodic table?
The element located between magnesium and chlorine on the periodic table is argon
What is the electron configuration of a sodium atom?
The electron configuration of a sodium atom is 1s^2, 2s^2, 2p^6, 3s^1
what is the origin of the periodic law, and how does it relate to the periodic table?
The periodic law is a fundamental principle of chemistry that states the physical and chemical properties of elements are periodic functions of their atomic numbers.
What is the ionic charge for hcl?
Since HCL is ionic charge is balanced then the total charge is 0
What is the difference between the periods and groups on the periodic table
The periods on the periodic table are the horizontal rows that represent the number of electron shells in an atoms structure, while the groups are the vertical columns that represent elements with similar properties