Vocabulary
What is an atom that has gained or lost electrons?
An Ion
If a neutral sodium atom (11 protons, 11 electrons) loses one electron, its charge is
+1
What is the number on the periodic table that equals the number of protons and neutrons?
The mass number.
How many valence electrons does fluorine have?
7
Heterogeneous or homogenous, Italian salad dressing?
Heterogeneous
A positively charged ion.
Cation
If an atom gains three electrons, what is its overall charge?
-3
Write isotope notation (mass and atomic numbers) for Oxygen-17
¹⁷8O
What is the name of the model/diagram that is used to represent valence electrons?
Lewis Dot Structure
Is burning paper a chemical or physical change?
Chemical
A negatively charged ion.
Anion
Magnesium is in group 2 (2 valence electrons). Would it most likely gain or lose electrons to satisfy octet rule, and what ion forms?
For ⁵⁶₂₆Fe, how many protons and how many neutrons?
26 protons and 30 neutrons
How many valence electrons are in the following model? (phosphorus)
5
Which state of matter has a definite volume and definite shape?
Solid
What are the outermost electrons in an atom called?
Identify whether this is an atom or ion: 3 protons, 2 electrons. Give the net charge.
Ion, +1 net charge
Write the isotope notation for an atom with 11 neutrons and 10 protons?
2110Ne
How many valence electrons does the element that ends at 3s2 have?
2
Is salt dissolved in water a compound, mixture, or element?
Mixture
Rule that atoms follow to reach a full set of typically eight valence electrons.
The octet rule
Explain why atoms on left of periodic table tend to form positive ions while those on right form negative ions.
The ones on the left have less than 4 valence electrons, so they give their away to complete the octet rule.
The ones one the right have more than 4, so they gain more electrons to complete the octet rule.
What is different about Carbon-12 and Carbon-13?
Carbon 12 has a mass of 12 and Carbon-13 has a mass of 13. They have different numbers of neutrons (6 for C-12 and 7 for C-13).
Draw the Lewis dot structure of Nitrogen
Check
What is the name of the phase change from a gas to a solid?
Deposition