An atom of element $$\(Q\)$$ contains 19 electrons, 19 protons and 20 neutrons. What is Q ?
A.
calcium
B.
potassium
C.
strontium
D.
yttrium
Exam No：0620_s25_qp_11 Year：2025 Question No：3
Answer:
B
Knowledge points:
3.2.1. Describe relative atomic mass, Ar, as the average mass of the isotopes of an element compared to 1/12th of the mass
Solution:
Download APP for more features
1. Tons of answers.
2. Smarter Al tools enhance your learning journey.
IOS
Download
Download
Android
Download
Download
Google Play
Download
Download