1. Write the correct molecular formula for ionic compounds formed metal and nonm

Question

1. Write the correct molecular formula for ionic compounds formed metal and nonmetal are combined together:

A)Potassium and sulfur

B)Calcium and Oxygen

C)Aluminum and bromine

D)Barium and nitrogen

2. Write the symbol (including the charge) for each of the following ions:

A) An ion with protons and 36 electrons

B)An ion with 7 protons and 10 electron

3.State the number of electrons than must be gained or lost by atoms of each of the following elements to acquire a full octet ( a noble gas electron arrangement). Be sure, if the electrons were or lost.

Element

Number of electrons

Were the electrons gained or lost

Phosphorus (p)

Magnesium (Mg)

Chlorine (CI)

Sodium (Na)

5. Draw the atom for the halogen (Group 7A) in the second row of the periodic table

6. Draw the atom for alkaline earth metal (Group 2A) in the third row of the periodic table

Element

Number of electrons

Were the electrons gained or lost

Phosphorus (p)

Magnesium (Mg)

Chlorine (CI)

Sodium (Na)

Explanation / Answer

1)
A)
potassium forms K+ ion and Sulfur forms S2- ion
The compound is
K2S

B)
Calcium forms Ca2+ ion and Oxygen forms O2- ion
The compound is
CaO

C)
Aluminium forms Al3+ ion and Bromine forms Br- ion
The compound is
AlBr3

D)
Barium forms Ba2+ ion and Nitrogen forms N3- ion
The compound is
Ba3N2

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