Answer:
23 atoms
Explanation:
Krypton (Kr) exists naturally as a mixture of six isotopes with atomic number of 36. These six isotopes occupy different percentages of the mixture. Below is a list of the isotopes and there percentage in a given mixture
1) Krypton-78 (⁷⁸Kr) ⇒ 0.35%
2) Krypton-80 (⁸⁰Kr) ⇒ 2.25%
3) Krypton-82 (⁸²Kr) ⇒ 11.6%
4) Krypton-83 (⁸³Kr) ⇒ 11.5%
5) Krypton-84 (⁸⁴Kr) ⇒ 57%
6) Krypton-86 (⁸⁶Kr) ⇒ 17.3%
To determine the amount of ⁸³Kr present in a mixture of 200 atoms of krypton, you will multiply the it's percentage of occurrence in nature by the amount of atoms in a given mixture
11.5/100 × 200 = 23 atoms
Hence, there should be 23 atoms of krypton-83 in the mixture of 200 atoms of Krypton.
3. Decreases
The concentration of hydrogen ions increasing creates an acid, which is 7 or below on the pH scale. If the pH value lessens from 7 to create an acid, that would mean it decreases.
Answer:
5.1 Crystal structure and habit.
5.2 Hardness.
5.3 Lustre and diaphaneity.
5.4 Colour and streak.
5.5 Cleavage, parting, fracture, and tenacity.
5.6 Specific gravity.
5.7 Other properties.
Hello there,
In a hydrogen the neutrons and protons are as follows:
Now with a hydrogen with a -3 isotope:
- 3 - 1 = 2 which means that you have 2 neutrons
A hydrogen with a -3 isotope would have 1 proton and 2 neutrons.
Hope I helped,
Amna
