Atoms are individual units of matter that make up all matter.
What makes up an atom?
A densely packed nucleus of protons and neutrons surrounded by electrons
What are the properties of a proton?
Proton has a charge of +1 and a relative mass of 1
What are the properties of a neutron?
Neutron has a charge of nothing and a relative mass of 1
What are the properties of an electron?
Electron has a charge of -1 and no relative mass
Why do electrons remain near nucleus?
Due to electrostatic forces of attraction.
What letter represents the mass number?
A
What letter represents the atomic number?
Z
What letter represents the Chemical symbol?
X
Is mass above atomic number in nuclear symbol?
Yes.
What is an isotope?
An atom with a different mass, different number of neutrons.
What is an ion?
An atom with a different number of electrons.
Define Valency?
the number of electrons in the outershell, increasingacross a period due to the increase in atomicnumber but constantdown a group.
Define Molecule.
Contains the same type of atoms, existing as individual atoms or atoms held together by chemical bonds.
Define Molecule.
Two or more atoms of the same element joined together chemically.
Define Compound.
Two or more atoms of different elements joined chemically.
What is a mixture?
is made up of two or more substances that are notchemically bonded. The properties of a mixture depend on the identity and amount of each substances that is a component of the mixture.