1.2 Atoms

Pregunta	Respuesta
What is an element?	A substance that is made of only one type of atom
What do groups in the periodic table show?	Elements with similar properties
Describe structure of an atom	Small central nucleus which is made up of protons and neutrons and around which there are electrons
What is the relative electrical charge of protons?	+1
What is the relative electrical charge of neutrons?	0
What is the relative electrical charge of electrons?	-1
In an atom, what is the number of electrons equal to?	The number of protons in the nucleus
Do atoms have an overall electrical charge?	No
What is the atomic number of an element?	The number of protons
What is the mass number of an element?	The sum of protons and neutrons in an atom
What do all atoms of a particular element have the same number of?	Protons
What are isotopes?	Atoms of the same element with different numbers of neutrons
What do electrons occupy?	Particular energy levels
Do the electrons in an atom occupy the highest or lowest available energy level?	Lowest
What is the mass of a proton?	1
What is the mass of a neutron?	1
What is the mass of an electron?	Very small
What is the relative atomic mass of an element?	It compares the mass of atoms of the element with the 12C isotope It is an average value for the isotopes of the element

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