unit test Flashcards
the only metal element that is a liquid at room temperature is
mercury
the only non mental element that is a liquid at room temperature is
bromine
the Lanthanides and actinides are referred to as
inner transition metals
the number of protons and neutrons
increase across the rows (periods)
the size of electron shells
decrease across the rows
how many electrons are in the outer shell of group 2 elements
2
which of the following would be largest size diameter
silver
in the Bohr-ruther model of an atom
the atom is mostly empty space
in a chemical formula each type of atom in the compound is shown by numbers called
subscripts
the size of the electron shells of every element in a family increase going down
there is an increase in the density of the nucleus
the size of every element going across a period decreases why?
there is an increase in the density of the nucleus
thee element that makes up a compound and the exact number of atoms of each element in a unit of the compound can be shown as a
chemical formula
what is the number of potassium atoms compared to oxygen atoms in a compound
2 potassium 1 oxygene
when Na and Cl form a compound what is the charge
neutral
if mg loses its valence electron it would become a
cation
