Answer: An element with the same number of protons, but a different number of neutrons
Explanation:
The # of protons in an atom is what determines what atom it is (hydrogen has 1 proton, helium has 2 protons, etc ...). You cannot change the number of protons in an atom without changing what element the atom is.
The number of electrons in atoms varies greatly because electrons are constantly gained, lost, and shared during chemical reactions.
An isotope is a variation of the same element (so they must have the same # of protons) that have different masses (and therefore a different number of neutrons).
The answer is the fourth choice, "An element with the same number of protons, but a different number of neutrons"
Answer:
Higher principal energy levels consist of orbitals which are larger in size than the orbitals from lower energy levels. The effect of the greater number of principal energy levels outweighs the increase in nuclear charge and so atomic radius increases down a group.
Answer: False
Explanation: the temperature increases with altitude
Answer:
The ratios of mole O2 to mole KClO3 are: 3/2, 1.5/1,1/2
Explanation:
The 3 possible equation of reaction for the decomposition of KClO3 are:
2KClO3 ==> 2KCl + 3O2
KClO3 ==> KCl + 1.5O2
2KClO3 ==> 2KClO2 + O2
When potassium chlorate (KClO3) is heated in the presence of manganese dioxide catalyst, it decomposes to form potassium chloride and oxygen gas.