what is lithiums atomic number? which of the following models also represents a lithium atom?
what is lithiums atomic number? which of the following models also represents a lithium atom?
Answer
Explanation:
Step1: Recall atomic number definition
Atomic number = number of protons.
Step2: Count protons in given lithium - atom model
In the given model, there are 3 protons. So, lithium's atomic number is 3.
Step3: Identify correct lithium - atom model
A lithium atom has 3 protons. The model with 3 protons (yellow + charged particles in the nucleus) is the correct one. The second model from the left has 3 protons.
Answer:
3 The second model from the left.