Atom
Where are protons located in an atom?
They are in the nucleus.
What does the atomic number of an element represent?
The number of protons.
What is a chemical reaction?
It's the process in which atoms are rearranged to produce new substances.
What is an isotope?
The same element with a different number of neutrons.
What is the definition of the atom?
An atom is the smallest particles into which an element can be divided and still be the same element.
What are the four parts of a square on the periodic table?
chemical name, atomic number, average atomic mass, and chemical symbol.
What is the law of conversation of mass?
It states that matter is neither created or destroyed in ordinary physical and chemical change.
what is a vertical line on the periodic table called?
it's a group or a family.
What charge does an electron have?
It has a negative charge.
What is the definition of malleable?
able to be formed into different shapes.
What is the type of chemical reaction that requires an input of energy?
Endothermic reaction
What is a horizontal line on the periodic table called
it's a period
What does the mass number of an element represent?
It represents the sum of protons and neutrons in that element.
What is the definition of ductile?
Can be made into wires.
What is the type of chemical reaction that requires the release of energy?
Exothermic reaction.
What are the four ways that can affect the rate of a chemical reaction?
-add concentration
-increase surface area
-increase temperature
-add catalyst
Who proved that elements are made up of smaller particles?
J.J.Thomson.
Where are valence electrons usually found?
In the outermost portion of the electron cloud.
What is the law of conversation of energy?
Energy cannot be created or destroyed.
Where does Dmitri Mendeleev come from?
Russia