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Science Chapter 5
Terms in this set (50)
The electrons that are in the highest energy level of an atom and that are involved in chemical reactions.
Is the force that holds atom together/the pulling force between two atoms that holds them together
A representation of the valence electrons in an atom using dots.
Electron dot diagram
What information does an electron dot diagram show?
The number of valence electrons for an element
Summarize hoe the periodic table is organized and tell why this organization is useful?
The periodic table is organized by increasing atomic number.It s useful because it can help determine which element will combine with which and how.
The number of what will remain the same from top to bottom in a group in the periodic table.
Most atoms become less reactive after a change to a total number of___________________ valence electrons.
The most stable of elements in the periodic table are found in family of.
Noble gases/Family 18
Explain why the alkali metals i group 1 are always found in nature combined with other elements?
The alkali metals in group 1 have 1 valence electrons which make them highly reactive.They then combine with other elements to complete their outer shell.The alkali metals react with any other things that are present in the surroundings
The number of protons in the nucleus of an atom is called.
How are the elements arranged in the periodic table
Increasing atomic number
The elements of group 17 are also called the _________ gases.
What property makes the alkali metals very reactive?
The only have 1 valence electron
An atom or group of atoms that has become electrically charged.
An ion that is made of more than one atom.
The attraction between oppositely charge ions.
A compound that consists of positive and negative ions
A combination of symbols that represents the elements in a compound and their proportions
A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound
An ordering, three dimensional pattern of ions or atoms in a solid in a molecule
A chemical bond formed when two atoms share electrons
A neutral particle made of two or more atoms joined by covalent bonds
A chemical bond formed when atoms share two pairs of electrons
A chemical bond formed when atoms share three pairs of electrons
A compound that is composed of molecules
A covalent bond in which electrons are shared unequally
A covalent bond in which electrons are shared equally
Atoms in polar covalent bonds carry slight _________.
When atoms ________,_______,or__________ electrons the atoms react or join together chemically.
-8 valence electrons
-unlikely to give up electrons to other atoms
-do not react easily with other atoms
-react very easily
-become stable by losing 1 electron
-hydrogen is located in this group but is not considered a metal
- become stable by gaining 1 electron
How reactive a ________ is depending on how easily its atom lose valence electrons
When ions join together to form ionic compounds, the ___________ ions are always surrounded by _____________ on all sides.
_________ of ionic compounds cannot conduct electric current
The _____________ _____________ _____________ of the nucleus of each atim holds the sharedd electrons in place
Positive electric charge
the number of ____________ ___________ an atom can form depends on its number of valence elctrons
Most _____________ _____________ do not conduct electric current
A mixture of two or more elements and at least one element is a metal
In a ___________ ___________ the atoms exist as a positive ions
The ________________ are held in place by metallic bonds
The attraction between a positive ion and the electrons around it.
Valence electrons in an atom are those that are
a.held most loosely
b.of the lowest energy level
c.always easily lost
d.never easily lost
A. held most loosely
When an atoms loses or gains electrons it becomes
The metal atoms in stainless steel are held together by
Which element is less reactive, an element whose atoms have seven electrons or an element whose atoms have eight valence electrons.Explain?
The element whose atoms have eight valence electrons because to be able to react with another you need to combine and make a total of eight valence electrons, but an element can't do that is they already have eight valence electrons.This family or group is group 18 known as the noble gases.
Why do ionic compounds generally have high melting points?
Ionic bonds form a result of the attraction between positive and negative ions.This is also called an ionic compound and because the ionic bonds are strong, there is a lot of energy that is needed to break them.Making the ionic compound have a high melting point.
How is the formula of an ionic bond different from the formula of a covalent bond?
The formation is different because an ionic bond is an attraction between oppositely charged ions.A covalent bond is a chemical bond when the atoms share electrons.
Why is the covalent bond between two atoms of the same element a nonpolar bond?
The atoms of the same element would equally share the electrons making them balanced.
Explain how metallic bonding causes metals to conduct electric current.
Metallic bonding causes metals to conduct electric current because metals conduct current easily because the electrons in a metal can move freely among the atoms.A metallic bind is the attraction between a positive metal ion and the electrons around it.
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