The atom is composed of protons , neutrons and electrons
Atoms have a nucleus containing protons and neutrons .
Electrons move around the nucleus of the atom
All atoms have a nucleus . The nucleus is always positively charged as it contains protons which have a positive charge and neutrons which do not have a charge .
The nucleus contains more than 99% of the mass of the atom
The total number of protons in an atoms nucleus must be the same as the total electrons in the outer shells
Electrons in atoms always orbit the nucleus and have a negative charge
Atoms are always neutral because the positive charge from protons cancels out the negative charge from electrons
The nucleus of a atom of an element may contain different number neutrons .
The diameter of the atom is about 10 to the power of -10 . Whereas the diameter of the nucleus is much smaller at around 10 to the power of -15
An electron will move from a lower to a higher orbit if it absorbs electromagnetic radiation .
An electron will move from a higher to lower obit if it emits electromagnetic radiation.
Is an image of an electron absorbing electromagnetic radiation
Is an image of an atom if it emits electromagnetic radiation
The atom is the smallest part of an element that can exist
All substances are made of atoms
Atoms are very small with a radius of 0.1nm
An element contains only one type of atom
Elements are found on the periodic table
There are about 100 elements.
An isotope is the same element with a different number of nuetrons