Answer:
True
Explanation:
Hydrogen is one of the most abundant elements in the universe so yes
This is because iron is more reactive than copper in the metal reactivity series.
The metal reactivity series (descending order) :
Potassium, sodium, calcium, Magnesium, aluminum, zinc, iron, lead, copper, mercury, silver, platinum, gold
The more reactive an element is, the harder it is to extract it from their ore.
In order to extract iron from iron(ii) oxide, we must heat it with carbon, so that carbon can form carbon dioxide with oxygen, so that iron is extracted. On the other hand, we just need to hear copper oxide in the air in order to extract copper metal.
Because of the difference in extracting the metals, we can know that why iron tools are more difficult to obtain than the copper ones.
Electronegativity.
Electronegativity can be defined as the measure of affinity of the element towards electrons . Higher the affinity towards electrons higher the electronegativity.
Eg : Fluorine has a high electronegativity. This is because it has 7 valence electrons, to gain a noble gas configuration / complete outer shell it needs to gain one electron. Hence the positive nuclear charge of the nucleus will attract an electron so it can become a complete outer shell , therefore F is very reactive.
Higher the attraction of the nucleus to electrons , higher its affinity therefore higher electronegativity.
1.78L x (3.00M/1L) = 5.34
Answer:
6.022×1023
Here, it has been asked how many eggs are in one mole of eggs. The eggs represent the unit which can be atom, ion or molecule. So by the definition of mole, 6.022×1023number of eggs are present in one mole of eggs.
