Question

use the periodic table to find the numbers of protons, neutrons, and electrons for atoms of the following elements.
name of element element symbol mass number atomic number protons neutrons electrons
boron b 11 5 5 6 5
sodium na 24 11 11 11 11
yttrium y 89 39 39 40 39
copper cu 64 29 29 35
technetium tc 98 43 43
lead pb 207
thallium 204 81
hydrogen h 0
carbon 12
nitrogen n 7
barium ba 56
calcium ca
silicon si 14
argon ar 18
magnesium mg 12 12

Explanation:

Step1: Recall atomic - structure rules

The atomic number is equal to the number of protons and the number of electrons in a neutral atom. The number of neutrons is calculated as the mass number minus the atomic number.

Step2: Complete the table for each element

• Sodium (Na): Atomic number = 11, Mass number = 24. Protons = 11, Neutrons = 24 - 11=13, Electrons = 11.
• Yttrium (Y): Atomic number = 39, Mass number = 89. Protons = 39, Neutrons = 89 - 39 = 50, Electrons = 39.
• Copper (Cu): Atomic number = 29, Mass number = 64. Protons = 29, Neutrons = 64 - 29 = 35, Electrons = 29.
• Technetium (Tc): Atomic number = 43, Mass number = 98. Protons = 43, Neutrons = 98 - 43 = 55, Electrons = 43.
• Lead (Pb): Atomic number = 82, Mass number = 207. Protons = 82, Neutrons = 207 - 82 = 125, Electrons = 82.
• Thallium (Tl): Atomic number = 81, Mass number = 204. Protons = 81, Neutrons = 204 - 81 = 123, Electrons = 81.
• Hydrogen (H): Atomic number = 1, Mass number = 1. Protons = 1, Neutrons = 1 - 1 = 0, Electrons = 1.
• Carbon (C): Atomic number = 6, Mass number = 12. Protons = 6, Neutrons = 12 - 6 = 6, Electrons = 6.
• Nitrogen (N): Atomic number = 7, Mass number = 14. Protons = 7, Neutrons = 14 - 7 = 7, Electrons = 7.
• Barium (Ba): Atomic number = 56, Mass number = 137. Protons = 56, Neutrons = 137 - 56 = 81, Electrons = 56.
• Calcium (Ca): Atomic number = 20, Mass number = 40. Protons = 20, Neutrons = 40 - 20 = 20, Electrons = 20.
• Silicon (Si): Atomic number = 14, Mass number = 28. Protons = 14, Neutrons = 28 - 14 = 14, Electrons = 14.
• Argon (Ar): Atomic number = 18, Mass number = 40. Protons = 18, Neutrons = 40 - 18 = 22, Electrons = 18.
• Magnesium (Mg): Atomic number = 12, Mass number = 24. Protons = 12, Neutrons = 24 - 12 = 12, Electrons = 12.

Answer:

Name of Element	Element Symbol	Mass Number	Atomic Number	Protons	Neutrons	Electrons
Sodium	Na	24	11	11	13	11
Yttrium	Y	89	39	39	50	39
Copper	Cu	64	29	29	35	29
Technetium	Tc	98	43	43	55	43
Lead	Pb	207	82	82	125	82
Thallium	Tl	204	81	81	123	81
Hydrogen	H	1	1	1	0	1
Carbon	C	12	6	6	6	6
Nitrogen	N	14	7	7	7	7
Barium	Ba	137	56	56	81	56
Calcium	Ca	40	20	20	20	20
Silicon	Si	28	14	14	14	14
Argon	Ar	40	18	18	22	18
Magnesium	Mg	24	12	12	12	12