Over 100 existing elements are listed and classified on the ____________________.
Answers
Final answer:
The Periodic Table of Elements lists over 100 known elements, providing critical information such as the element's atomic number, symbol, name, and atomic mass. Elements are grouped based on their chemical properties and electron configuration.
Explanation:
Over 100 existing elements are systematically organized and displayed on the Periodic Table of Elements. Each box on the Periodic Table represents a different element and provides critical information such as the element's atomic number, symbol, name, and atomic mass. Elements are grouped together based on their chemical properties and electron configuration, which is a representation of the organization of electrons around the nucleus.
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Final answer:
Over a hundred elements, both naturally occurring and experimentally discovered, are listed and classified on the Periodic Table of the Elements. They are sorted by atomic number, and those with similar properties and valence shells are grouped into columns and rows respectively.
Explanation:
Over 100 existing elements are listed and classified on the Periodic Table of the Elements. This list of elements is arranged in ascending order of atomic number, which is the number of protons in each nucleus. The periodic table not only identifies the chemical symbol, atomic number, and mass number of each element but also groups elements according to their propensity to react with other elements.
It's important to note that elements found on the periodic table have an equal number of protons and electrons. However, the number of protons and neutrons may not always be equal across all elements. In addition to the 92 naturally occurring elements, there are several larger, unstable elements that have been discovered experimentally
Aside from organizing elements according to their atomic number, the periodic table is also structured in a way that elements with similar properties compose columns in the table, while elements with the same number of valence shells compose rows, making it an essential tool for understanding and predicting chemical behaviors.
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b. alpha
c. proton
d. positron
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(1) Energy is emitted.
(2) Energy is absorbed.
(3) The number of electrons decreases.
(4) The number of electrons increases.
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Answer: The correct option is (1).
Explanation:
Whenever an atom in an excited state returns back to its ground state the energy is emitted out in the form of the radiation and the value of energy emitted can be determined by using the expression:
Where E = Energy of the radiation in joules
h = Planck's constant =
= Wavelength of the radiation in meters.
It is emitted by photons in the form of light, or in some cases, heat.
Answers
->
Hence, option B is correct.
What is a balanced equation?
A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total oxidation numbers is the same for both the reactants and the products.
->
represents a balanced chemical equation.
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Answers
Because there are 73 Protons and that equals the Atomic Number .. what is the element that is 73 as its atomic number?
Tantalum
Because we know that there are 73 Protons and 108 Neutrons ..we could do this 73+108 = 181
So its name is Tantalum-181
hope this helps.
Final answer:
The mass number of an atom with 92 protons and 108 neutrons is 200.
Explanation:
To calculate the mass number of an atom that has 92 protons and 108 neutrons, you simply add these two numbers together. The mass number of an atom is comprised of the total number of protons and neutrons in its nucleus. So, 92 protons + 108 neutrons = 200. Therefore, the mass number of the atom is 200.
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Answers
N2 +3 I2 = 2NI3
We are given the amount of product formed. This will be the starting point of our calculations.
3.58 g NI3 ( 1 mol NI3 / 394.71 g NI3 ) ( 3 mol I2 / 2 mol NI3 ) = 0.014 mol I2.
Thus, 0.014 mol of I2 is needed to form the given amount of NI3.
Answer:
Answer is 0.0136.
Explanation:
(2) electrical energy to chemical energy
(3) chemical energy to light energy
(4) chemical energy to electrical energy