Answer:
The charge of the ion is 2+.
Explanation:
The amount of neutrons is extra information. You just need to compare the amount of electrons to the amount of protons for the ion's charge.
Answer:
it is because of Dark Matter
Dark Matter, component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity. Dark matter makes up 30.1 percent of the matter-energy composition of the universe; the rest is dark energy (69.4 percent) and “ordinary” visible matter (0.5 percent).
Dark matter is composed of particles that do not absorb, reflect, or emit light, so they cannot be detected by observing electromagnetic radiation. Dark matter is material that cannot be seen directly.
Explanation:
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Answer:
When most substances lose or gain energy, one of two things happens to the substance: its temperature changes or its state changes. The temperature of a substance is related to the speed of the substance’s particles. So, when the temperature of a substance changes, the speed of the particles also changes. But the temperature of a substance does not change until the change of state is complete.
Explanation:
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noah
2moles
1.20moles
0.5mole
Explanation:
Given parameters:
Mass of He = 8g
Mass of Zn = 78g 
Volume of oxygen gas= 11.2L
Unknown:
Number of moles of He, Zn = ?
Number of moles of oxygen gas = ?
Solution;
Number of moles of substances is given as :
Number of moles = 
molar mass of He = 4g/mol
molar mass of Zn = 65.4g/mol
Number of moles of He = 
= 2moles
Number of moles of Zn = 
1.20moles
For gases at STP;
Number of moles = 
Number of moles = 
= 0.5mole
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Number of moles brainly.com/question/1841136
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Answer:
0.807 moles
Explanation:
No of molecules = No of mole × Avogadro's number
No of mole = No of molecules / Avogadro's number
No of mole = 5.24×10^23/6.02×10^23
0.870 moles
