WebOct 5, 2024 · Ans. 1. The number of elements in the first three periods depends on the electron capacity of the shells and the law of electron octet. The electron capacity of third shell is 18. So the third period should actually contain 18 elements. But it contains only 8 elements due to the law of electron octet. 2. The third shell i.e. the m- shell has n = 3. WebThe elements were “pure” but could not be found in that state on earth. Every visible thing was made up of some combination of earth, water, air, and fire. The four elements were even used to described the four …
3.5: Pure Substances and Mixtures - Chemistry LibreTexts
WebAug 17, 2024 · As 5, 6 and 4 are maximum elements from two arrays giving second array higher priority. Order of elements is same in output as in input. Input : arr1 [] = {7, 4, 8, 0, 1} arr2 [] = {9, 7, 2, 3, 6} Output : 9 7 6 4 8. Recommended: Please try your approach on {IDE} first, before moving on to the solution. Approach : We create an auxiliary array ... WebAug 20, 2024 · Q.1. Assertion : Second period consists of 8 elements. Reason : Number of elements in each period is four times the number of atomic orbitals available in the energy level that is being filled. Answer Answer: (c) Number of elements in each period is twice the number of atomic orbitals available in the energy level that is being filled. red felt poker chip table with dark wooden
Maximize elements using another array - GeeksforGeeks
WebThere are over 80 naturally occurring elements, with uranium (92 protons) being the heaviest (heavier nuclei have been produced in reactors). Nuclei also contain certain neutrons, usually in numbers greater than the number of protons. The number of neutrons in the atoms of a given element varies. WebMar 17, 2024 · Of the known elements, 11 (hydrogen, nitrogen, oxygen, fluorine, chlorine, and the six noble gases) are gases under ordinary conditions, two (bromine and mercury) are liquids (two more, cesium and gallium, melt at about or just above room … Research during the past century has demonstrated that the composition of … The mineral fuels—coal, petroleum, and natural gas—may be described as a … It is believed that these heavier elements, and some isotopes of lighter elements, … The possible chemical composition of a highly evolved star is a series of layers … An ore deposit, in its simplest terms, is a portion of the Earth’s crust from which … transition metal, any of various chemical elements that have valence … mercury (Hg), also called quicksilver, chemical element, liquid metal of Group … iron (Fe), chemical element, metal of Group 8 (VIIIb) of the periodic table, the most … alumina, also called aluminum oxide, synthetically produced aluminum oxide, … WebAug 23, 2024 · Element or Compound? Consists of: Lead (Pb) element: lead atoms: Oxygen gas (O 2) element: oxygen molecules* Water (H 2 O) compound: water molecules: Ammonia (NH 3) compound: ammonia molecules red felting wool