☰ Contents · Chemistry

Composition of the nucleus. Isotopes

Lessons 7–8 · 2 lessons · I.R. Asqarov, K. G‘opirov, N.X. To‘xtaboyev. Chemistry Grade 8, revised 4th edition. “Yangiyul Poligraph Service”, Tashkent, 2019
Answers are for parents and teachers.
1
How many protons and neutrons are in phosphorus (Z = 15, A = 31)?
2
Number of neutrons in lead (Z = 82, A = 207)?
3
Rubidium: ⁸⁵Rb (72 %) and ⁸⁷Rb (28 %). Calculate the average Aᵣ.
4
Why are ¹³C and ¹⁴N isotones?
5
How many protons and neutrons are in the tritium nucleus (³H)?