Explanation:
Helium exists in three different forms due to the phenomenon of isotopy. Isotopy is the existence of two or more atoms of the same element having the same atomic number but different mass numbers due to the differences in the number of neutrons in their nuclei.
- The atoms of these elements are called isotopes.
- This is why Helium can exist in three different forms.
- Isotopes have the same electronic configuration but with the same chemical properties.
Learn more:
isotopes brainly.com/question/1915462
Isotopy brainly.com/question/2593342
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Explanation:
The best way to separate the mixture is by using a bar magnet. We explore the magnetic property of the iron fillings in the mixture to separate it out.
- The mixture is spread out thinly on a flat surface.
- A bar magnet is hovered above the spread of the mixture
- The magnet attracts the iron fillings to itself
- This will leave the salt behind in the mixture.
Answer:
Covalent bonding and non-covalent bonding
Answer;
Ge and As.
Explanation;
Elements Ge and As belong in the same period as krypton.
Each row of the periodic table is called the period.
Elements in each period have the same number of electron shells.
These elements in the same period do not have similar properties- the properties change greatly across every period. Krypton is in period four therefore all the elements in period 4 have four electrons shells.
First one. Coefficients are numbers that balance the equation, just like if there is an equation in math where 1=2, you need to multiply 1 by 2 to make that equation true. That's a nice jingle you can remember.