Question

in an atom, in stable atoms, the number of protons, the number of neutrons (in some of the number of neutrons and a decimal number, which is the number of protons and neutrons combined). to find the number (usually you will subtract the atomic number from the atomic mass. using your periodic table, and what you read above, find the number of protons, neutrons and electrons for each of the following elements: example: hydrogen atomic # 1 # of protons 1 # of neutrons 0 # of electrons 1 atomic mass (rounded to the nearest whole number) 1 element lithium oxygen sodium

Explanation:

Step1: Recall periodic - table properties

The atomic number of an element is equal to the number of protons. The number of electrons in a neutral atom is equal to the number of protons. The mass number is the sum of protons and neutrons.

Step2: Find data for Hydrogen (H)

Hydrogen has an atomic number of 1. So, the number of protons = 1, and the number of electrons in a neutral atom = 1. The atomic mass of hydrogen is approximately 1 (rounded to the nearest whole number). Using the formula Mass number=Protons + Neutrons, and since Protons = 1 and Mass number = 1, then Neutrons=Mass number - Protons = 1 - 1=0.

Step3: Find data for Lithium (Li)

Lithium has an atomic number of 3. So, the number of protons = 3, and the number of electrons in a neutral atom = 3. The atomic mass of lithium is approximately 7 (rounded to the nearest whole number). Using the formula Mass number=Protons + Neutrons, Neutrons = Mass number - Protons=7 - 3 = 4.

Step4: Find data for Oxygen (O)

Oxygen has an atomic number of 8. So, the number of protons = 8, and the number of electrons in a neutral atom = 8. The atomic mass of oxygen is approximately 16 (rounded to the nearest whole number). Using the formula Mass number=Protons + Neutrons, Neutrons = Mass number - Protons=16 - 8 = 8.

Step5: Find data for Sodium (Na)

Sodium has an atomic number of 11. So, the number of protons = 11, and the number of electrons in a neutral atom = 11. The atomic mass of sodium is approximately 23 (rounded to the nearest whole number). Using the formula Mass number=Protons + Neutrons, Neutrons = Mass number - Protons=23 - 11 = 12.

Element	Atomic #	Atomic Mass (Rounded to the whole number)	# of Protons	# of Neutrons	# of Electrons
Lithium (Li)	3	7	3	4	3
Oxygen (O)	8	16	8	8	8
Sodium (Na)	11	23	11	12	11

Answer:

Element	Atomic #	Atomic Mass (Rounded to the whole number)	# of Protons	# of Neutrons	# of Electrons
Lithium (Li)	3	7	3	4	3
Oxygen (O)	8	16	8	8	8
Sodium (Na)	11	23	11	12	11