Answer:
D.4
Explanation:
Number of neutron= mass number - atomic number
where; d no of neutron is 5
d mass no is 9
atomic number be x
5=9-x
x=9-5
x=4
S orbital:spherical
P orbital:dumbbell
D orbital:double dumbbell
F orbital:complex
1-if u are answering light waves question , then the answer is translucent mirror or objects
2- Oxygen
3- compass
Liquid
737.5mmHg
Answer:500
