Question

1. complete the following chart.

	k	mg	na	n	cl	si
period
group #
family name (if any)
# of valence e⁻
# protons
metal, nonmetal, or metalloid?
conducts electricity? (yes/no)
state at room temperature?
ion formed? (positive, negative, none, varies)

1. ____________ metal
2. ____________ chlorine
3. ____________ metalloid
4. ____________ transition elements
5. ____________ group 1
6. ____________ noble gases
7. ____________ group 2

b. metals with unpredictable properties
c. a halogen
d. make good semiconductors
e. alkali metals
f. has a full outer energy level (shell)
g. loses electrons in bonding

Explanation:

Step1: Recall element properties

Use the periodic - table to find properties of K (potassium), Mg (magnesium), Na (sodium), N (nitrogen), Cl (chlorine), and Si (silicon).

Step2: Fill atomic number

K has atomic number 19, Mg has 12, Na has 11, N has 7, Cl has 17, Si has 14.

Step3: Fill period

K is in period 4, Mg in period 3, Na in period 3, N in period 2, Cl in period 3, Si in period 3.

Step4: Fill group number

K is in group 1, Mg in group 2, Na in group 1, N in group 15, Cl in group 17, Si in group 14.

Step5: Fill family name

K is an alkali metal, Mg is an alkaline - earth metal, Na is an alkali metal, N is a pnictogen, Cl is a halogen, Si is a metalloid.

Step6: Fill valence electrons

K has 1 valence electron, Mg has 2, Na has 1, N has 5, Cl has 7, Si has 4.

Step7: Fill number of protons

Number of protons = atomic number. So K has 19 protons, Mg has 12, Na has 11, N has 7, Cl has 17, Si has 14.

Step8: Fill metal/non - metal/metalloid

K is a metal, Mg is a metal, Na is a metal, N is a non - metal, Cl is a non - metal, Si is a metalloid.

Step9: Fill electricity conduction

K, Mg, Na are metals and conduct electricity (yes), N and Cl are non - metals and do not conduct well (no), Si is a semiconductor and can conduct under certain conditions (yes).

Step10: Fill state at room temperature

K, Mg, Na are solids, N is a gas, Cl is a gas, Si is a solid.

Step11: Fill ion formed

K forms a positive ion (K⁺), Mg forms a positive ion (Mg²⁺), Na forms a positive ion (Na⁺), N can form a negative ion (N³⁻), Cl forms a negative ion (Cl⁻), Si can form positive or negative ions in different compounds.

	K	Mg	Na	N	Cl	Si
Period	4	3	3	2	3	3
Group #	1	2	1	15	17	14
Family name (if any)	Alkali metal	Alkaline - earth metal	Alkali metal	Pnictogen	Halogen	Metalloid
# of valence e⁻	1	2	1	5	7	4
# protons	19	12	11	7	17	14
Metal, nonmetal, or metalloid?	Metal	Metal	Metal	Non - metal	Non - metal	Metalloid
Conducts electricity? (yes/no)	Yes	Yes	Yes	No	No	Yes
State at room temperature?	Solid	Solid	Solid	Gas	Gas	Solid
Ion Formed? (positive, negative, none, varies)	Positive	Positive	Positive	Negative	Negative	Varies

Answer:

The completed table is shown above.