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The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows ("periods") and columns ("groups"). It is an icon of chemistry and is widely used in physics and other sciences.
Generation Z (often shortened to Gen Z), also known as Zoomers, [1] [2] [3] is the demographic cohort succeeding Millennials and preceding Generation Alpha.Researchers and popular media use the mid-to-late 1990s as starting birth years and the early 2010s as ending birth years, with the generation most frequently being defined as people born from 1997 to 2012. [4]
Atomic number (Z): 11: Group: group 1: hydrogen and alkali metals: Period: period 3: Block s-block Electron configuration [] 3sElectrons per shell: 2, 8, 1: Physical properties; Phase at STP
An armed conflict between Israel and Hamas-led Palestinian militant groups [ab] has been taking place in the Gaza Strip and Israel since 7 October 2023. It is the fifth war of the Gaza–Israel conflict since 2008, and the most significant military engagement in the region since the Yom Kippur War, in 1973. [135]
John Fitzgerald Kennedy (May 29, 1917 – November 22, 1963), often referred to as JFK, was an American politician who served as the 35th president of the United States from 1961 until his assassination in 1963.
Gross domestic product (GDP) is the market value of all final goods and services from a nation in a given year. [2] Countries are sorted by nominal GDP estimates from financial and statistical institutions, which are calculated at market or government official exchange rates.
A chemical element is a chemical substance that cannot be broken down into other substances by chemical reactions.The basic particle that constitutes a chemical element is the atom.
Various machine components used in mechanical engineering. Mechanical engineering is the study of physical machines that may involve force and movement. It is an engineering branch that combines engineering physics and mathematics principles with materials science, to design, analyze, manufacture, and maintain mechanical systems. [1]