Vocabulary
What is a Valence electron?
Have the highest energy and are involved in chemical bonding.
How many protons does a Nitrogen atom have?
7
The atomic number increases from ____ to ____ across each period, as does the number of valence electrons.
left to right
The atomic number of an element is?
The number of protons in each atom of that element.
How do metal atoms react?
by losing their valence electrons.
What does the electron dot diagram include and what do the dots stand for?
The symbol of the element surrounded by dots. The dots stand for one valence electron.
_________ an elements reactivity is determined by the number of protons found in an atom of the element.
valence electrons
nonmetals become stable when?
their atoms gain or share enough electrons to have 8 valence electrons.
If elements in a group always have the same number of valence electrons. What else is similar?
Their properties
what reacts easily with other elements?
Halogens
What is a chemical bond?
The force of attraction that holds atoms together as a result of the rearrangement of electrons between them.
Reactive
A metals reactivity depends on what?
How easily it loses valence electrons
Group 18 elements are _____ ______. They have 8 valence electrons except for _____?
Nobel Gases
Helium
What would happen if an alkali metal was combined with a halogen?
The alkali metal would give up an electron to the halogen
When atoms bond, Valence electrons may be ____ from one atom to another or ____ between the atoms.
transfered
shared
What determines an elements chemistry?
The number of valence electrons in each atom helps determine the chemical properties of that element.
When metalloids combine with with other elements what happens to their valence electrons?
They either lose or share them.
Chemists have been able to make some noble gases ___ ______ with a few other elements.
form compounds
How many Valence electrons are in atoms of group 13
three
What is an ionic bond?
The attraction between two oppositely charged ions.
why?
phosphorus because unlike neon both elements are in the same group and have the same number of valence electrons/
draw an electron dot diagram for Barium
"BA" with 1 dot above it and one dot to the right
hydrogen shares ____ when forming _______ with other nonmetals to obtain a stable arrangement of 2 electrons
electron
compounds
Fluorine and Chlorine are in group ____. The fluorine atom has __ valence electrons. the chlorine atom has __ valence electrons.
17
7
7