Question

complete the following information for lithium.

of protons # of electrons # of neutrons total number of particles group period

3 3

Explanation:

Step1: Determine number of neutrons

Lithium - 7 is the most common isotope. Mass number (A) = 7, atomic number (Z) = 3. Number of neutrons (N)=A - Z. So, N = 7 - 3 = 4.

Step2: Calculate total number of particles

Total number of particles = number of protons+number of electrons+number of neutrons. So, 3 + 3+4 = 10.

Step3: Find group number

Lithium has 1 valence electron, so it is in Group 1 (alkali metals).

Step4: Find period number

Lithium has 2 electron - shells, so it is in Period 2.

Answer:

# OF PROTONS	# OF ELECTRONS	# OF NEUTRONS	TOTAL NUMBER OF PARTICLES	GROUP	PERIOD