Exercises

Write the chemical symbols for the following chemical elements:
(a) SiliconAnswer
(b) SilverAnswer
(c) HeliumAnswer
(d) PotassiumAnswer
(e) MagnesiumAnswer
(f) IronAnswer
Lithium has two naturally-occurring isotopes, lithium-6 and lithium-7. Lithium-6 has a mass of 6.01512 relative to carbon-12 and makes up 7.42 percent of all naturally occurring lithium. Lithium-7 has a mass of 7.016 compared to carbon-12 and makes up the remaining 92.58 percent. According to this information, what is the atomic weight of lithium?Answer
Identify the number of protons, neutrons, and electrons in the following isotopes:
(a) ¹²₆CAnswer
(b)¹₁HAnswer
(c)⁴⁰₁₈ArAnswer
(d)²₁HAnswer
(e)¹⁹⁷₇₉AuAnswer
(f) ²³⁵₉₂UAnswer
Identify the period and family in the periodic table for the following elements:
(a) RadonAnswer
(b) SodiumAnswer
(c) CopperAnswer
(d) NeonAnswer
(e) IodineAnswer
(f) LeadAnswer
How many outer shell electrons are found in an atom of:
(a) LiAnswer
(b) NAnswer
(c) FAnswer
(d) ClAnswer
(e) RzaAnswer
(f) BeAnswer
Write electron dot notations for the following elements:Answer
(a) Boron
(b) Bromine
(c) Calcium
(d) Potassium
(e) Oxygen
(f) Sulfur
Identify the charge on the following ions:
(a) BoronAnswer
(b) BromineAnswer
(c) CalciumAnswer
(d) PotassiumAnswer
(e) OxygenAnswer
(f) NitrogenAnswer
Use the periodic table to identify if the following are metals, nonmetals, or semiconductors:
(a) KryptonAnswer
(b) CesiumAnswer
(c) SiliconAnswer
(d) SulfurAnswer
(e) MolybdenumAnswer
(f) PlutoniumAnswer
From their charges, predict the periodic table family number for the following ions:
(a) Br²¹Answer
(b) K¹¹Answer
(c) Al¹³Answer
(d) S²²Answer
(e) Ba¹²Answer
(f) O²²Answer
Use chemical symbols and numbers to identify the following isotopes:Answer
(a) Oxygen-16
(b) Sodium-23
(c) Hydrogen-3
(d) Chlorine-35

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