Terms in this set (19)
occours when atoms join together to form a new substance.
How can valance electrons in an atom help you to predict if the atom will form a bond?
most atoms beed 8 valance electrons. if it has less than 8 it will form a bond. hydrogen, helium, lithium
how can an atom that has 5 valence electrons acheive a full set of valence electrons
they share or gain 3 electrons
how many electrons are in barium atom
how does an atom become a positive ion? A negative ion?
Atoms becom negative ions by gainning electrons and atoms become positive ions by loosing electrons.
what is an ionic compound?
react with non-metals. When ionic bonds form the number of electrons lost by the metal atoms equal the number gained by non-metal atoms. The ions that bond are charged but the compounds formed is nutral because the changes of the ions cancell eachother out.
which group of elements gains 2 valence electrons when the atoms form ionic bonds
group 16 has 10 less than the group number.
explain why ionic compounds are neutral even though they are made up of charged particles.
they are netural because the umber of electrons lost by the metal atom is equal to the nummber of electrons gained by the non-metal atoms
explain the diffrence between the formations of positive ions with the formation of negative ions in term of energy loss.
energy is needed to make positive ions and energy is given off when negative ions are formed.
what happens to the electrons in a covalant bond?
the electrons are shared
what is an electron dot diagram
is a modle that shows only valence electrons in an atom
how many dots does an electron dot diagram of a sulfer atom have?
what are 3 properties of metals that are a result of metalic bonds
ductile, malubility, and electricalconductivity
how does the valence electrons in a metal move
valance electrons "swim" around the metal ions to hold them together
how do the mwtallic bonds ina staple allow it to fumction properly
allows it to bend without breaking. It is able to hold the paper together.
usally noble gases do not form bonds. why?
they dont form bonds because they are full
what has happened to an atom if it has 2- charege
they gained 2 electrons. It is negative because it has 2 more electrons
how many valence electrons are in a fluorine atom? will fluorine atoms bond?
it will try and find another electron so it will become full.
this electron-dot diagram is not complete. which atom needes to form another bond
the carbon atom neede to form another bond
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