1. Write symbols for each of the isotopes: a. Each atom contains one proton and
ID: 484127 • Letter: 1
Question
1. Write symbols for each of the isotopes:
a. Each atom contains one proton and two neutrons
b. Each atom contains 92 protons and 146 neutrons.
2. One element lithium has two naturally occurring isotopes. One of these has a mass of 6.0151amu and a natural abundance of 7.49%. A second isotope has a mass of 7.0160 amu and a natural abundance of 92.51%. Calculate the atomic mass of lithium.
3. For each of the elements Ca, K, Cu, Zn, Br and Kr, provide the following information:
a. Which are metals? ____________________
b. Which are representative metals? ____________________
c. Which are inert or noble gases? ____________________
Explanation / Answer
1. a] 1H
b] 238U
2. Atomic mass = ( 6.0151 x 7.49) + ( 7.0160 x 92.51)/ 100
= 45.053 +649.050/100
= 694.103/100
= 6.94 amu
3. a] Metals are Ca,K,Cu,Zn
b] Represenatvive metals Br
c] Inert or noble gases Kr
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.