The correct answer is C. 118.
The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number (the number of protons in the nucleus), electron configurations, and recurring chemical properties. The structure of the table
shows periodic trends. The seven rows of the table, called periods, generally have metals on the left and non-metals on the right. The columns, called groups, contain elements with similar chemical behaviours. Six groups have accepted names as well as assigned numbers: for example, group 17 elements are the halogens; and group 18 are the noble gases. Also displayed are four simple rectangular areas or blocks associated with the filling of different atomic orbitals.The periodic table is a powerful tool for organizing and understanding the chemical elements. It can be used to predict the properties of elements, to identify elements that may be useful for specific applications, and to track the progress of chemical research.
The periodic table was first published in 1869 by Dmitri Mendeleev. Mendeleev arranged the elements in order of increasing atomic weight, and he noted that elements with similar properties fell into groups. The periodic table has been revised several times since then, as new elements have been discovered and our understanding of chemistry has improved.
The periodic table is an essential tool for any chemist, and it is also used by scientists in other fields, such as physics, biology, and engineering. It is a powerful tool for understanding the world around us.
Option A is incorrect because there are 118 elements in the periodic table, not 112.
Option B is incorrect because there are 118 elements in the periodic table, not 115.
Option D is incorrect because there are 118 elements in the periodic table, not 127.