2.167*10^22 atoms of hydrogen
Answer:
A:increase from left to right and top to bottom
Explanation:
on the periodic table it's shows it increasing for left to right and decreasing from top to bottom
Helium (He) has the lowest melting point of <span>-272.2 °C.</span>
Answer:
B
Explanation:
This would be due to enthalpy. This is because that this where heat exchange happens in chemical reactions.
So, a positive enthalpy means that the reaction is endothermic (heat entering) and if enthalpy is negative this will be a exothermic (heat released)
Another example would be the use of atoms. This example if temperature is the factor, this means that at low temp there is less kinetic energy so low temperature. However, an increase in energy means that there is more kinetic energy in the atoms which means that more collisions occurring.
Hope this helps !!!!
Have a nice day :)
