Question

What symbol represents an atom of K 40?

Answer 1

Answer:

potassium. is answer

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Answer 2

Answer:

Isotope of Potassium having Mass number 40.

Explanation:

Potassium (19-K) has 26 known isotopes from K-31 to K-57, with the exception of still-unknown K-32, as well as an unconfirmed report of 59. Three of those isotopes occur naturally: the two stable forms K-39 (93.3%) and K-41 (6.7%), and a very long-lived radioisotope K-40(0.012%)

Naturally occurring radioactive K-40 decays with a half-life of 1.248×$10^{9}$ years.