An atom has 20 protons, 20 neutrons, and 20 electrons. What atom is being described?
A. neon (atomic number 10)
B. calcium (atomic number 20)
C. zirconium (atomic number 40)
D. neodymium (atomic number 60)
Answer:B
An atom has 20 protons, 20 neutrons, and 20 electrons. What atom is being described?
A. neon (atomic number 10) B. calcium (atomic number 20) C. zirconium (atomic number 40) D. neodymium (atomic number 60)