Answer:
An element is a pure substance that cannot be broken down into different types of substances. ... Examples of elements include carbon, oxygen, hydrogen, gold, silver and iron. Each element is made up of just one type of atom. An atom is the smallest particle of an element that still characterizes the element.
Explanation:
Pure substances found on the periodic table are called elements. They can be further divided into categories like main-group elements, transition metals, and inner transition metals such as alkali metals and chalcogens, based on their properties and compound formation.
Pure substances that are found on the periodic table are referred to as elements.
These elements, which include substances like iron, silver, gold, aluminum, sulfur, oxygen, and copper, cannot be broken down into simpler substances via chemical changes.
The elements on the periodic table can be further subdivided based on their properties. For instance, we have the main-group elements, transition metals, and inner transition metals, each which sit in specific locations on the periodic table. A great example would be the elements in group 1, also referred to as the alkali metals. All alkali metals share similar chemical properties and they form compounds that consist of one atom of the element and one atom of hydrogen.
Another example is the chalcogens, also known as the oxygen group or oxygen family. Essentially, the periodic table serves as a map of all the known elements, each with unique properties that classify them as a certain type of element and determine their positioning on the table.
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b. potential energy
c. activation energy
d. thermodynamic energy
Answer: Potential Energy
Explanation:
The term that best describes the stored energy based on the position or chemical composition of an object is its potential energy. It is the energy possessed by a body due to its virtue of its position. Any body at rest possesses this energy because they are in one position (not moving).
An object thrown up possesses potential energy at its maximum height before falling under gravity because the object is at rest at the maximum height.
A rate equation can be written based on the rate constant k, concentration of reactants and half life time t1/2 of reactant if given. [A⁰] is the initial concentration of reactant A and [A]t be the final concentration.
Rate of a reaction is the rate of decrease in concentration of reactants or rate of increase in concentration of products. Rate of the reaction written in terms of molar concentration of reactants is called the rate law.
Consider the simplest reaction A gives B. Here the only one reactant is A. The molar concentration of A is written as [A]. The rate constant k is then,
k = [B] / [A]
If any coefficients attached with them it is written as power of the concentration term. Now, the rate of the above reaction is written as follows:
rate r = k [A]
Sometimes the initial and final concentrations of A can be considered. Where, [A⁰] is the initial concentration and [A]t be the final concentration.
The half life t1/2 is the time taken to consume half of the reactants concentration.
To find more about rate law, refer the link below:
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The atom X has 15 electrons.
The number of electrons in an atom is equal to the number of protons. Since the atom X has 15 protons, it also has 15 electrons.
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