Question

complete the following table:

name	symbol	atomic number	mass number	number of neutrons	number of electrons
sodium	na
		12	24		12
	ti
	ag
	f
carbon					6
	he
		8		8	8
argon		18			18
	ga
		4	9		4
		7		7	7

Answer:

To complete the table, we use the following relationships:

• Atomic number (\(Z\)) = Number of protons = Number of electrons (in neutral atoms).
• Mass number (\(A\)) = Atomic number (\(Z\)) + Number of neutrons (\(N\)) (\(A = Z + N\)).

1. Sodium (Na)

• Atomic number (\(Z\)) for Na is 11 (from periodic table).
• Number of electrons = \(Z = 11\).
• Mass number: Common isotope is \(A = 23\) (most stable).
• Neutrons: \(N = A - Z = 23 - 11 = 12\).

2. Atomic number = 12 (Magnesium, Mg)

• Name: Magnesium (Mg, from periodic table, \(Z = 12\)).
• Number of neutrons: \(N = A - Z = 24 - 12 = 12\).
• Number of electrons = \(Z = 12\) (neutral atom).

3. Titanium (Ti)

• Atomic number (\(Z\)) for Ti is 22 (periodic table).
• Number of electrons = \(Z = 22\) (neutral atom).
• Mass number: Common isotope \(A = 48\) (most stable).
• Neutrons: \(N = 48 - 22 = 26\).

4. Silver (Ag)

• Atomic number (\(Z\)) for Ag is 47 (periodic table).
• Number of electrons = \(Z = 47\) (neutral atom).
• Mass number: Common isotope \(A = 108\).
• Neutrons: \(N = 108 - 47 = 61\).

5. Fluorine (F)

• Atomic number (\(Z\)) for F is 9 (periodic table).
• Number of electrons = \(Z = 9\) (neutral atom).
• Mass number: Common isotope \(A = 19\).
• Neutrons: \(N = 19 - 9 = 10\).

6. Carbon (C)

• Symbol: C (periodic table, \(Z = 6\)).
• Atomic number \(Z = 6\) (since electrons = 6).
• Mass number: Common isotope \(A = 12\) (most stable).
• Neutrons: \(N = 12 - 6 = 6\).

7. Helium (He)

• Atomic number (\(Z\)) for He is 2 (periodic table).
• Number of electrons = \(Z = 2\) (neutral atom).
• Mass number: Common isotope \(A = 4\).
• Neutrons: \(N = 4 - 2 = 2\).

8. Atomic number = 8 (Oxygen, O)

• Name: Oxygen (O, \(Z = 8\)).
• Mass number: \(A = Z + N = 8 + 8 = 16\).
• Number of electrons = \(Z = 8\) (neutral atom).

9. Argon (Ar)

• Symbol: Ar (periodic table, \(Z = 18\)).
• Mass number: Common isotope \(A = 40\).
• Neutrons: \(N = 40 - 18 = 22\).
• Number of electrons = \(Z = 18\) (neutral atom).

10. Gallium (Ga)

• Atomic number (\(Z\)) for Ga is 31 (periodic table).
• Number of electrons = \(Z = 31\) (neutral atom).
• Mass number: Common isotope \(A = 70\).
• Neutrons: \(N = 70 - 31 = 39\).

11. Atomic number = 4 (Beryllium, Be)

• Name: Beryllium (Be, \(Z = 4\)).
• Neutrons: \(N = A - Z = 9 - 4 = 5\).
• Number of electrons = \(Z = 4\) (neutral atom).

12. Atomic number = 7 (Nitrogen, N)

• Name: Nitrogen (N, \(Z = 7\)).
• Mass number: \(A = Z + N = 7 + 7 = 14\).
• Number of electrons = \(Z = 7\) (neutral atom).

Completed Table (Key Entries):

Name	Symbol	Atomic Number	Mass Number	Number of Neutrons	Number of Electrons
Sodium	Na	11	23	12	11
Magnesium	Mg	12	24	12	12
Titanium	Ti	22	48	26	22
Silver	Ag	47	108	61	47
Fluorine	F	9	19	10	9
Carbon	C	6	12	6	6
Helium	He	2	4	2	2
Oxygen	O	8	16	8	8
Argon	Ar	18	40	22	18
Gallium	Ga	31	70	39	31
Beryllium	Be	4	9	5	4
Nitrogen	N	7	14	7	7

(Note: Mass numbers use the most stable/common isotopes for each element.)