a single atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it?\no k\no…
a single atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it?\no k\no zr\no ca\no sc
Answer
Explanation:
Step1: Recall element - identification rule
The atomic number of an element is equal to the number of protons in its atom.
Step2: Determine the atomic number
Given that the atom has 20 protons, so the atomic number (Z = 20).
Step3: Identify the element
Looking at the periodic - table, the element with atomic number 20 is calcium (Ca).
Answer:
Ca