Scientists
Father of Modern Chemistry
Who is Dimitri Mendeleev?
Equal to the number of protons that are present in the nucleus of an atom.
What is an electron?
Number of electrons in first energy level
What are two electrons?
States that repeating chemical & physical properties of elements change periodically with atomic number of the elements
What is periodic law?
Has a 1+ charge
What is an alkali metal ion?
Atoms make up everything, can't be divided, atoms of given elements are the same and atoms combine to form compounds
What is Dalton's theory?
Non-charged particles in the nucleus of an atom
What is a neutron?
Number of electrons in second energy level.
What are 8 electrons?
Horizontal row on the table = to the number of orbitals in the row.
What is a period?
Has a 1- charge
What is a halogen?
Electrons are located in energy levels and orbit the nucleus like planets orbiting the sun
What is Bohr's theory?
Not a neutron but has no charge.
What is an unreacted atom?
Number of electrons in third energy level?
What are 18 electrons?
Vertical row in which elements share characteristics
What is a column or family?
Has a 2 - charge
What is column sixteen?
Electrons are in the electron cloud and behave like particles on a vibrating string?
What is modern atomic theory?
Positively charged particles found in the nucleus of an atom
What are protons?
Number of electrons in fourth energy level.
What are 32?
Found on the left hand side of the periodic table
What are metals?
Has a positive charge
What is a cation?
Named the atom as something which couldn't be divided.
Who is Democritus?
Tiny, negatively charged particles outside the nucleus of an atom.
What are electrons?
Each of these can hold two electrons
What is an orbital?
Found between the metals and non-metals
What is a metalloid or semiconductor?
Has a negative charge
What is an anion?