51.5k views
5 votes
Count the number of neutrons in Cesium-130/55 (Cs) A. 55 B. 75 C. 130 D. 185

2 Answers

4 votes

the given element is

¹³⁰₅₅Cs

the superscript - 130 is the atomic mass / mass number

mass number is the sum of protons and neutrons

subscript - 55 is the atomic number

atomic number is the number of protons

therefore we can write the following equations

protons = 55

protons + neutrons = 130

so neutrons = 130 - protons

nuetrons = 130 - 55 = 75

number of neutrons = 75

User May Oakes
by
8.8k points
6 votes
The answer to the question is letter B which is 75. Cesium or also called as cesium is a chemical element with the symbol Cs. It is a silvery-gold element which is soft alkalai metal with melting point of 28.5 C. 
User Smartkid
by
8.8k points

No related questions found