How do you find the mass number of an element
2 answers:
Answer:
- <em>To find the mass number of an element </em>you<em> </em><u>add up the number of protons (atomic number) and neutrons.</u>
Explanation:
The <em>mass number</em> is a specific property of the atoms, defined as the sum of the protons and neutrons, which are the subatomic particles that are in the nucleus of the atom.
The electrons do not count for the mass of atoms because their mass is about 1/1840 the mass of a proton or a neutron.
The relative masses of protons and neutrons is 1: 1, then they count equally.
As an example, the mass number of the atom carbon-12 is calculated in this way:
- Atomic number of carbon: Z = 6 (6 protons)
- Number of neutrons: N = 6
- Mass number: A = Z + N = 6 + 6 = 12.
The number 12 added to the name in carbon-12, stands for its mass number.
Also, the mass number is indicated as a superscript to the left of the chemical symbol of the element, and the atomic number as a subscript to the left of the chemical symbol. For the example of carbon-12 that is:
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Answer:
The correct answer is reaction will achieve equilibrium by forming more products and will move in left to right direction.
Explanation:
Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as
K is the constant of a certain reaction when it is in equilibrium, while Q is the quotient of activities of products and reactants at any stage other than equilibrium of a reaction.
- If Q >
, then the equilibrium will shift in left direction or in backward direction.the reaction will move back to the formation of reactants from the product
- If Q <