Here are the names, element signs, and also atomic numbers of the initially 20 facets of the regular table.

You are watching: Which statements are true about the periodic table

It’s handy to understand the initially 20 aspects of the periodic table. Around 99% of the mass of the humale body is made of 6 of these aspects. The first 20 aspects are likewise a great overwatch of the different facet groups. They also take place in more day-to-day chemical reactions. The facets are provided in order of increasing atomic number. The atomic number is the variety of proloads in atoms of each aspect.

In order of raising atomic number, the first 20 aspects and their symbols are:

Helium (He)Lithium (Li)Beryllium (Be)Boron (B)Carbon (C)Nitrogen (N)Oxygen (O)Fluorine (F)Neon (Ne)Sodium (Na)Magnesium (Mg)Aluminum (Al)Silicon (Si)Phosphorus (P)Sulfur (S)Chlorine (Cl)Argon (Ar)Potassium (K)Calcium (Ca)

What Makes Them Elements?

At a minimum, matter should contain one or more prolots to be an aspect. The number of proloads identifies the aspect. Atoms of aspects might additionally contain neutrons together with protons to create the atomic nucleus. Samples with the same variety of prolots however various numbers of neutrons are all the exact same element however are various isotopes. Atoms also have actually electrons that orlittle around the nucleus. Changing the number of electrons roughly an atom renders it an ion, however doesn’t change its identity as an element. Elements are referred to as the structure blocks of matter because their atoms can’t be separated into smaller sized parts utilizing any type of chemical means. Atoms of facets can develop chemical bonds through one another to develop compounds.


Element Names and Symbols

Elements may be established making use of their atomic number, element name, or element symbol. The symbol is a one- or two-letter abbreviation of the name. However before, some signs refer to old aspect names. For instance, the symbol for sodium is Na. This describes the Latin word natrium, which was the old name for caustic soda. The symbol of potassium is K, which stands for the Latin word kalium, which supposed alkali or potash. The initially letter of an element symbol is capitalized. When there is a second letter, it is reduced instance.

A Closer Look at the First 20 Elements

Here is a brief summary of each of the initially 20 elements, including appearance, state of matter under normal temperature and press, atomic number, symbol, atomic mass, electron configuration, and also facet group:

Hydrogen
Hydrogen is the first element and also is the most abundant one in the world.
Atomic Number: 1 Symbol: H Atomic Mass: 1.008 Electron Configuration:1s1 Group: team 1, s-block, nonmetalHelium Atomic Number: 2 Symbol: He Atomic Mass:4.002602(2) Electron Configuration:1s2 Group: group 18, s-block, noble gasLithium
Lithium is a extremely reactive metal.

See more: Which Of The Following Conditions Will Create A Biased Estimator Of A Population Parameter?


Atomic Number: 3 Symbol: Li Atomic Mass:6.94(6.938–6.997) Electron Configuration: 2s1 Group: group 1, s-block, alkali metalBeryllium Atomic Number: 4 Symbol: Be Atomic Mass:9.0121831(5) Electron Configuration: 2s2 Group: group 2, s-block, alkaline earth metalBoron Atomic Number: 5 Symbol: B Atomic Mass:10.81(10.806–10.821) Electron Configuration: 2s22p1 Group: team 13, p-block, metalloidCarbon Atomic Number: 6 Symbol: C Atomic Mass:12.011(12.0096–12.0116) Electron Configuration: 2s22p2 Group: group 14, p-block, commonly a nonsteel although sometimes thought about a metalloidNitrogen Atomic Number: 7 Symbol: N Atomic Mass:14.007 Electron Configuration: 2s​22p3 Group: group 15 (pnictogens), p-block, nonmetalOxygen Atomic Number: 8 Symbol: O Atomic Mass:15.999 or 16.00 Electron Configuration: 2s22p4 Group: team 16 (chalcogens), p-block, nonmetalFluorine Atomic Number: 9 Symbol: F Atomic Mass:18.998403163(6) Electron Configuration: 2s22p5 Group:group 17, p-block, halogenNeonAtomic Number: 10 Symbol: Ne Atomic Mass:20.1797(6) Electron Configuration: 2s22p6 Group: group 18, p-block, noble gasSodium Atomic Number: 11 Symbol: Na Atomic Mass:22.98976928(2) Electron Configuration: 3s1 Group: team 1, s-block, alkali metalMagnesium Atomic Number: 12 Symbol: Mg Atomic Mass:24.305 Electron Configuration: 3s2 Group: team 2, s-block, alkaline earth metalAluminum Atomic Number: 13 Symbol: Al Atomic Mass:26.9815385(7) Electron Configuration: 3s23p1 Group: group 13, p-block, thought about a post-transition metal or periodically a metalloidSilicon Atomic Number: 14 Symbol: Si Atomic Mass:28.085 Electron Configuration: 3s23p2 Group: team 14 (carbon group), p-block, metalloidPhosphorus Atomic Number: 15 Symbol: P Atomic Mass:30.973761998(5) Electron Configuration: 3s23p3 Group: team 15 (pnictogens), p-block, normally considered a nonsteel, however sometimes a metalloidSulfur
Sulhair is a yellow nonmetal.

Categories

CategoriesSelect Category4th of July7th Grade ScienceAlchemyAnalytical ChemistryAstronomyBiochemistryBiologyBiology DictionaryChemistryChemistry DictionaryChemistry NotesChemisattempt ProblemsChemistry ProjectsCrystalsElement GroupsElement QuizzesElementsEnergyEventsFamous ScientistsFire and Flames ProjectsFood ChemistryFree Science PrintablesGeologyGlow in the DarkHalloweenHoliday ScienceHow Stuff WorksIceland Solar Eclipse and AuroraLaboratoryMarine BiologyMaterialsMathematicsMeasurementNanochemistryOceanographyOpticsPeriodic TablePhysicsPhysics Example ProblemsScience DictionariesScience FairScience HistoryScience NotesScience Notes by GradeScience ProjectsScience QuizzesScientific MethodTechUncategorizedWeather

· © 2021 Science Notes and Projects · Designed by Press Customizr ·· Cookie Policy ·