Question

isotopes and average atomic mass

1. using the chart below, describe the three subatomic particles that make up atoms.

name	location in atom	charge	mass (heavy or light)

1. define each term:

atomic number:
mass number (aka atomic mass):

1. for the element below, clearly label the atomic number and the atomic mass.

22 ti titanium 48

1. complete the table below:

element	atomic #	atomic mass	# protons	# neutrons	# electrons
	11
				10	9

Explanation:

1. Protons are in the nucleus, have a positive charge, and are heavy. Neutrons are in the nucleus, are neutral in charge, and are heavy. Electrons are outside the nucleus, have a negative charge, and are light.
2. Atomic number is the number of protons in an atom's nucleus. Mass number (atomic mass) is the sum of protons and neutrons in an atom's nucleus.
3. For titanium (Ti), the atomic number is 22 (the number above the symbol) and the atomic mass is 48 (the number below the symbol).
4. For the first row with Al: Atomic number is 13, atomic mass is 27, number of protons is 13 (equal to atomic number), number of neutrons is 27 - 13=14, number of electrons is 13 (in a neutral atom, electrons equal protons). For the second row with atomic number 11: It is sodium (Na), atomic mass is typically 23, number of protons is 11, number of neutrons is 23 - 11 = 12, number of electrons is 11. For the third row: Since electrons are 9 and neutrons are 10, assuming a neutral atom, protons are 9 (equal to electrons), atomic number is 9 (fluorine, F), and atomic mass is 9+10 = 19.

Answer:

1.

Name	Location in Atom	Charge	Mass (heavy or light)
Neutron	Nucleus	Neutral	Heavy
Electron	Outside nucleus	Negative	Light

1. Atomic Number: The number of protons in an atom's nucleus. Mass Number (aka atomic mass): The sum of protons and neutrons in an atom's nucleus.
2. Atomic number of Ti: 22, Atomic mass of Ti: 48

4.

Element	Atomic #	Atomic Mass	# Protons	# Neutrons	# Electrons
Na	11	23	11	12	11
F	9	19	9	10	9