group of elements located to the left of the stair-step line on the periodic table
What is metals
What is Hydrogen
The most chemically active of all the nonmetals
What is fluorine
term used to describe elements that are easily breakable
What is brittleness
A _______ consists of two atoms of the same element in a covalent bond
What is a diatomic molecule
The atomic number of an element tells you how many _______ it has in one atom
what are protons
least reactive group of elements on the periodic table are known as the__________
What are the noble gases
The atomic number of yttrium is 39. The atomic mass of one of its isotopes is 89. How many neutrons are in an atom of this isotope?
What is 50