Lesson 1
What is Bohr's first name
Niels
what is hydrogen
an element
what group is hydrogen in
group 1
what type of charge does potassium have
negative charge
acids react with certain metals to produce ______ gas
hydrogen
Who said that electrons move in certain orbits around an atom's nucleus
Bohr
what is a molecule
a group of two or more atoms
water is a ____
compound
what is a covalent bond
The chemical bond formed when two atoms share electrons
_____ and ____ don't react with acids
platinum and gold
What are nanowhiskers made of
carbon or silver
Mendeleev discovered a set of what that apply to all of the elements
patterns
how many valence electrons does magnesium have
2
what is a ion
it is a atom or a group of atoms
an acid is a compound that reacts with ______ and _______
metals and carbonates
What are nanowhiskers
they are tiny threads
substances made up of one or more atom is a
element
Hydrogen is the ____ element
lightest
ionic bonding is one way elements form ________
compounds
where is folic acid found
in green leafy vegetables
What gives a sea squirt its unique structure and shape?
The outer coverings and the openings
how are modern periodic tables arranged.
in order of increasing atomic number
electrons in higher energy levels have higher amounts of _______
energy
an atom is stable when the ______ energy level is filled with energy
outermost
limestone contains _____ ions
carbonate