Atomic structure Flashcards
What is an atom?
the smallest part of an element that keeps the properties of that element
What is an atom made up of?
the nucleus which is made up of protons and neutrons
electrons.
What is at the center of an atom?
a nucleus!
What does a nucleus of a hydrogen atom contain?
1 proton
What does the nucleus of all other atoms contain?
protons and neutrons
What is a mass number?
the atomic mass is the total number of protons and neutrons
What is an electron?
it is like a spread-out cloud of high energy that exists in the whole region.
What is it also called?
an electron cloud.
What are the region electrons occupy?
they are called energy shells which surround the nucleus.
How much do region electrons occupy?
accounts for over 99.9 % of the volume of an atom
What is a neutron?
it is a neutral subatomic particle found in the nucleus
what is a neutral not charged atom?
the number of protons is equal to the number of electrons
