Int. Science (Chemistry-atoms-9th)
Terms
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- The word meaning middle or center is
- Nucleus
- 2 atoms combine to form a
- Molecule
- The smallest whole unit of an element that still has the properties of that element is the
- Atom
- Atoms differ from one another because they have a different number of
- protons or diff. atomic number
- Bonding formed from electron transfer is called_______,and the resulting substance is called
-
ionic bond
ionic compound - Ionic bonding results in a lattice work formed from an attraction between______,That have different charges
-
ions
-+-
+-+ - Covalent bonding results in a ______ being formed
- Molecule
- If and atom gives up electrons it becomes a___________ ________
- Positive ion
- If an atom gains electrons it becomes a
- Negative Ion
- Which one of the following is a poitive ion, which is a negative ion, which is a negative ion, which is neutral
- see pink sheet
- C6H1206 is called a chemical _________
- Formula or compound
- How many carbons are there in # 11
- Six
- The numbers you used to count the atoms are called ______________
- Subscripts
- 2 Ca(PO4)2 Count the atoms in this formula
- 2Ca 4P 16 O
- The small number two is called a __________
- Subscript.
- The large number two is called a _______________
- Coefficient
- all atoms prefer 8 electrons in their outer shell. this is called the
- Octet rule.
- 2 elements prefer 2 electrons in their outer shell, they are_____ and ____
- He and H
- Horizontal rows in the periodic chart are called ___
- Periods
- Vertical columns are called
- Groups or Families
- As you go across the periodic chart, what is happening.
- Atomic # increases and Protons increase by 1.
- Name the following compounds
-
CuCl2
Ag2S
MgBr2 - The molecules in # 21 are binary compounds. What does binary compound mean
- Two elements
- Draw a Bohr atom of Oxygen
- Look at 6P and IV
- Draw a lewis dot of Oxygen
- Ch4 Melecular formula
- What is a balanced equation
- Atoms on both sides of arrow are equal.
- Refer to your balancing equation worksheet and make sure you understand how to balance equations.
- See W. 3
- Define a neutral atom
-
Same # of Protons in nucleus
Has no charge - Define and inert atom
-
Full shell on outside
Does not react. - Which atoms are inert
-
All of group 8 atoms
noble gases - Write the symbol of potassium with the atomic number and atomic mass.
-
39
K
19 - The number of electrons in the outer shell of an atom is called the ______________
- Valence
- How do you determine the number of valence electrons in an atom
- Look at the Group #
- When atoms gain, lose or share electrons with other atoms, they form chemcial____
- Bonds.
-
Atoms form cheical bonds in order to satisfy the ____
rule. - Octet
- O2 is an example of a molecule of an ______
- Element
- This is because the ____________________________
-
ATOMS ARE THE SAME.
Diatonic molecules.O2,Br2
Cl2,F2,H2 - If you have an atomic number of 10, the number of electrons is ____ in a neutral atom.
- 10
- If you have the 12 electrons, the number of protons is____ in the neutral atom.
- 12
- If you have an atomic number of 15 and an atomic mass of 35, the number of neutrons is _____
- 20
- What is an ion?
- Charged atom + or-
- If an atom has 20 protons, and has a charge of -1, then it mush have _____electrons.
- 21
- What is an ionic Bond
- Force between 2 opposite ions + and -.
- If an atom has 18 portons in the nucleus and 17 electrons in its orbitals, it must have a charge of_______
- +1
- The starting substances in a reaction are called _______
- Reactants
- What you end up with in a reaction are called
- Products.
- Give four ways you can tell a chemical reaction is occurring.
- Color change -Temp. Change Bubbles of gas - Precipitate(solid)
- Wat does pricitate mean
- 2 liquids --a solid
- What are the 4 phases of matter
- Plasma, gas, liquid, solid
- Draw a molecular formula for water
- H2O
- Draw a structural formula for water
-
O
H H - What additional information do you get in a structural formula.
- Where bonds are located
- Be able to write a word equation for any equation on your balancing worksheet
- See lead paint and Boggie lab
- Why are valence electrons important?
- Gives group # and they are involved in bonding.
- What determines which atom you have?
- Proton #
- What is the atomic mass of uranium
- 238
- What is the atomic number or Arsenic?
- 33
- What is the number of electrons in radon?
- 86
- How many electrons in a ion of Potassium with a +1 charge
- K+1 draw this ion.
- How many electrons in an ion of oxygen with a -2 charge
- O -2
- A______________ is a substance that cannot be broken down into simpler substances.
- Element
- A__________ is the smallest particle of a matter having all that element's characteristics.
- atom
- The ______ is made up of protons and neutrons.
- Nucleus
- Small particles that have mass and positive electrical charges are_________.
- Protons
- Particles that have about the same mass as protons, but that are electrically neutral are_________
- neutrons.
- Surrounding the nucleus of an atom are tiny particles called_______
- Electron, which have little mass, but have negative electrical charges that are exactly the same magnitude as the + charges of protons
- The number of protons in an atom's nucleus is the
- Atomic Number
- When atoms of the sme element have different mass numbers, they are known as ___________ of that element
- Isotopes
- The spontaneous process through which unstable nuclei emit radiation is called
- radioactivity
- A__________ represents the area in an atom where an electron is most likely to be found.
- energy level
- The ourtermost electrons of an atom are called.
- valence electrons
- The combined number of protons and neutrons is the
- mass number
- The _______ is the average of the mass numbers of the isotopes of an element
- atomic mass