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Chemistry Definition Atoms Questions and Answers 100% Solved
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Chemistry Definition Atoms
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Chemistry Definition AtomsAtom - answerAn atom is the smallest part of an element that can exist. Atoms are
electrically neutral, with a positively charged, dense nucleus (filled with protons and
neutrons) and surrounded by one or more electrons
Nucleus - answerthe dense, positively charged mass located in the centre of an atom
Subatomic - answerA term that means 'smaller than an atom'
Proton - answera positively charged subatomic particle that is found in the nucleus of an
atom
Electron - answera negatively charged subatomic particle that is found in the space
outside
the nucleus of an atom
Neutron - answera neutral subatomic particle that is found in the nucleus of an atom
Atomic number - answerthe number of protons in an atom of an element
Mass number - answerthe sum of the number of protons and neutrons in the nucleus of
an atom of an element
Isotopes - answeratoms of an element that have the same number of protons but
different numbers of neutrons
Relative atomic mass - answerThe weighted average of the isotopic masses of an
element, on a scale where an atom of carbon-12 has a mass of exactly 12 atomic mass
units
Electron levels
(or shells) - answerthe possible energies that electrons in an atom can have
Electron configuration - answerthe arrangement of electrons in the levels (or shells) of
an atom
(Niels) Bohr - answerThe man who discovered electron energy levels
Element - answerA pure substance which is made up of only one type of atom
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