how many energy levels contain electrons in the element li? 3 energy levels 2 energy levels 1 energy level
how many energy levels contain electrons in the element li? 3 energy levels 2 energy levels 1 energy level
Answer
Answer:
2 energy levels
Explanation:
Step1: Recall lithium's atomic number
Lithium (Li) has atomic number 3.
Step2: Write electron - configuration
The electron - configuration of Li is 1s²2s¹.
Step3: Determine energy levels
It has electrons in the 1st (1s) and 2nd (2s) energy levels, so 2 energy levels.