How Many Neutrons in Heavy Elements? Discover Now!


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Additional information

Chemical Earth

Question 16
Write down the number of protons, neutrons, and electrons
in each of the following (electrically neutral) atoms.
(a) 137Ba56
56p, 81n, 56e ↙
(b) 9Be4
4p, 5n, 4e ↙
(c) 238U92
92p, 146n, 92e ↙

Question 17
Write electron configurations for the following atoms.
(a) Carbon
atomic number: 6
2, 4 ↙
(b) Sulfur
atomic number: 16
2, 8, 6 ↙
(c) Calcium
atomic number: 20
2, 8, 8, 2 ↙

Question 18
Write electron configurations for the following ions.
(a) Cl-
atomic number: 17
2, 8, 8 ↙
(b) K+
atomic number: 19
2, 8, 8 ↙
(c) H+
atomic number: 1
No electrons ↙

Question 19
(a) Identify a technique that involves weighing to analyse the composition of a mixture.
Gravimetric analysis ↙
(b) Identify three examples where this technique could be useful.
Measuring percentage of alcohol in wine or other alcoholic drinks, finding the nutritional content of foods, finding the composition of soils. ↙

Question 20
Identify what is wrong with the following statement and
write it correctly: ‘Oxygen is a diatomic element.’
The molecules are diatomic, not the element.
A more correct statement would be:
‘Oxygen is an element that exists as diatomic molecules.’

Question 21
Write chemical formulae for the following compounds.
(a) Carbon tetrachloride
CCl4 ↙
(b) Iron (III) oxide
Fe2O3 ↙
(c) Phosphorus pentabromide
PBr5 ↙

Question 22
Name the following substances.
(a) FeO
Iron (II) Oxide ↙
(b) CF4
Carbon tetrafluoride ↙
(c) SiO2
Silicon dioxide ↙