In a calcium atom in the ground state, the electrons that possess the least amount of energy are located in the(1) first electron shell
(2) second electron shell
(3) third electron shell
(4) fourth electron shell
Answers
According to the electronic configuration, a calcium atom in the ground state electrons which possess least amount of energy are located in first shell.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elementshave valence shell complete in ground state and hence are said to be stable.
According to the electronic configuration,as the number of shells increases their energy also increases .Hence, electrons in first shell have least energy.
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Answer:
1
Explanation:
first electron shell.
First electron shell possesses the least amount of energy at the core.
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Answers
Explanation:
Answer and Explanation:
Oxygen-16 and oxygen-18 differ in structure only in that oxygen-18 has two more neutrons in its nucleus than oxygen-16 has.
There are three known stable isotopes of oxygen (8O): 16O, 17O, and 18O. Radioactive isotopes ranging from 11O to 26O have also been characterized, all short-lived.
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Answers
ANSWER: The comma attempts to separate a compound subject.
EXPLANATION: The comma is used in a sentence where a pause is necessary. In this statement, the comma is separating a compound sentence which was unnecessary. The whole sentence is joined by the word 'and' and doesn't need any other word to give a pause in the sentence.
The comma is used incorrectly in the sentence above because it attempts to join two independent clauses without a coordinating conjunction.
The sentence "The graduate students filled out the necessary applications" and "submitted the required references" are both independent clauses, each having its own subject and verb. However, the comma is not sufficient to connect these two clauses properly. To correct this, a coordinating conjunction like "and" should be used after the first independent clause, or the comma could be replaced with a semicolon. The current use of the comma creates a comma splice error, which is a common grammatical mistake.
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Answers
The correct answer is A) They all have similar chemical properties.
Explanation:
In chemistry, the periodic table organizes visually the chemical elements. In this, elements are arranged according to different features. In the case of families of the elements, these refer to elements organized in the same column, for example, elements that are in column 18 form a family called noble gases.
These elements form a family because they have chemical properties; in the case of noble gases, this includes similar reactivity and physical features such as color and odor. Besides this, the elements of one family share a similar electron configuration but not the same number of electrons. This means, from the options given the one that identifies the elements that belong to a family is "They all have similar chemical properties".
Each set of elements has an equal number of electrons in the outer orbital. We refer to these as valence electrons. Each element's chemical characteristics are determined by its valence electrons. The correct option is A.
The elements in the same group or column of the periodic table are those whose chemical characteristics are the most comparable. The vertical groups of elements that have the same number of valence electrons and, consequently, comparable chemical characteristics are formed when the elements are arranged in order of atomic number.
Only when matter changes to become a completely other sort of matter can chemical characteristics be measured or observed. They consist of flammability, reactivity, and rusting potential.
Thus the correct option is A.
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Answers
Answer:
C
Explanation:
Answer:
D
Explanation:
Not a because the term exo means outward, so exothermic means releasing energy so D.
Not B or C because they have nothing to do with exothermic (exo- outward thermic- energy)
Answers
Answer:
Explanation:
Hello,
In this case, it firstly necessary to understand how the complete (100%) dissociation of the potassium phosphate is done:
In such a way, since the freezing point depression and the boiling point elevation are computed as:
The corresponding van't Hoff factor is four as 3 potassiums and 1 phosphate as ions are obtained during the dissolution. In addition, the freezing point depression constant and boiling point elevation constant of water are 1.86 and 0.512 °C/m respectively. Moreover, the freezing point of water is 0 °C and the boiling point is 100 °C, therefore, the resulting freezing and boiling temperatures for the 2.59 m solution of potassium phosphate are:
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