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Elements and Chemical Bonds by Chance

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Chance Williams

on 2 May 2016

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Transcript of Elements and Chemical Bonds by Chance

Elements and Chemical Bonds by Chance
Multiple choice
Which of the following is a compound? a thing that is composed of two or more seperate elements or a mixture.

Why is water a covalent bond? Because the hydrogen and oxygen atoms have to share an electron to have the desired 8 electrons.

An ion is an atom that has gained or lost ____ an atoms

Atoms that gain electrons become ions with a _____ charge Positive

Which type of covalent bond is the molecule H2? It is nonpolar.
Multiple choice
How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable? 8 electrons

Why do the noble gases NOT form compounds readily? All have a full s and p outer electron shells and so do not form chemical compounds easily.




Key Terms
Chemical bond-Is a force that holds two or more atoms together.

Valence electron-Is an outermost electron of an atom that participates in chemical bonding.

Electron dot diagram-A model that represents valence electrons in an atom as dots around the elements chemical symbol.

Covalent bond-Is a chemical bond formed when two atoms share one or more pairs of valence electrons.

Molecule-Is a group of atoms held together by covalent bonding that acts as an independent unit.

Polar molecule-Is a molecule that has a partial positive and a partial negative end because of unequal sharing of electrons.

Chemical formula-Is a group of chemical symbols and numbers that represents that elements and the number of atoms of each element that make up a compound.

Ion-Is an atom that is no longer electrically neutral because it has lost or gained valence electrons.

Ionic bond-The attraction between positively and negatively charged ions in an ionic compound.

Metallic bond-Is a bond formed when many metal atoms share their pooled valence electrons.
True or False
Atoms of different elements have different numbers of protons.T

In a atom, an electron that is close to the nucleus is on the highest energy level.T

To become more chemically stable, an atom has two electrons in its outer energy level will gain two electrons.F

The N2 molecule is nonpolar.T


Multiple choice
water is a polar molecule because the shared electrons are pulled closer to the oxygen atom than the hydrogen atom.

Elements found on the far right of the periodic table in group 18, are referred to as ____and are chemically stable Noble gasses

Aluminum oxide is a chemical formula with two aluminum atoms and three oxygen atoms. Which is the correct chemical formula?

Al2O3

Most of the mass of an atom is found in its?
Nucleus

The particles that make up an atom are? protons, neutrons, and electrons
Multiple choice
In an atom, electrons?travel outside the nucleus.

The energy levels of an atom are occupied by. Electrons

What is the name given to the units that make up covalently bonded compounds. molecules

Which of the following elements will likely form a negative ion in its ionic compounds. Chlorine.

A chemical bond that occurs when atoms share electrons is an? ionic bond
True/False
Elements on the far right of the periodic table are classified as________ nonmetals

For an atom to be neutral, the number of protons must equal the number of _____.Electrons

Particles formed from the covalent bonding of atoms are called_____ions

Most atoms are chemically _____when its outer energy level 8 valence electrons. Stable
Complete each statement
Each nitrogen atom can share three valence electrons forming a ____covalent bond. triple

There are _____hydrogen atoms in the chemical formula CH4. four

The attraction between positive and negative ____forms an ionic bond. electrons

Metal atoms bond together to form a _____ bond. metallic.

Elements on the left side of the periodic table are classified as______.metals or alkali metals.
a.polar molecule
b.compound
c.symbol
d.formula
e.molecule
f.subscript
g.electron
h.nucleus
i.positive ion
j.negative ion
k. ionic bond
l.covalent bond
Matching
1. h. positively charged center of atom.
2. i. a charged atom that has gained one or more electrons
3. k. positive ion and negative ion joined together
4. e. neutral particles formed when atoms share electrons.
5. l. particle in which electrons are shared unequally
6. d. combination of symbols
7. c.. represents number of atoms in a chemical formula.
8. j. a charged atom that has lost one or more electrons.
9. g. negative particle in an atom
10. l. atoms joined together by sharing electrons.
short answer
Barium is in period 6 and magnesium is in period 3 of the periodic table. Which element would lose one electron more easily. answer Barium because the outer electrons are farther away from the nucleus.

What will the (B) atom do ti become more stable. The atom would want to get rid of an electron on its outer layer.
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