Ca Valence Electrons

Posted : admin | On 01-05-2021



Favorite Answer Ca In Ground State Have 2 Electrons in First Shell,8 In 2nd,8 in 3rd and 2 in 4th Ca+ ion As looses Two Electrons so than its Outer shell Consists of 8 electrons. Note: Calcium is in Group 2 (sometimes called Group II or 2A). Since it is in Group 2 it will have 2 valence electrons. When you draw the Lewis structure for Calcium you'll put two 'dots' or valance electrons around the element symbol (Ca). Apr 01, 2007 Ca has 20 electrons and 2 valence electrons. Ca2+ has 18 electrons and 0 valence electrons. Ca+ ( newer known) would have 19 electrons.

Element Calcium - Ca

Comprehensive data on the chemical element Calcium is provided on this page; including scores of properties, element names in many languages, most known nuclides of Calcium. Common chemical compounds are also provided for many elements. Webex cisco mac. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one's studies.

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Overview of Calcium

  • Atomic Number: 20
  • Group: 2
  • Period: 4
  • Series: Alkali Earth Metals

Calcium's Name in Other Languages

  • Latin: Calcium
  • Czech: Vápník
  • Croatian: Kalcij
  • French: Calcium
  • German: Kalzium - r
  • Italian: Calcio
  • Norwegian: Kalsium
  • Portuguese: Cálcio
  • Russian: Кальций
  • Spanish: Calcio
  • Swedish: Kalcium

Atomic Structure of Calcium

Valence Electrons Calculator

  • Atomic Radius: 2.23Å
  • Atomic Volume: 29.9cm3/mol
  • Covalent Radius: 1.74Å
  • Cross Section (Thermal Neutron Capture)σa/barns: 0.43
  • Crystal Structure: Cubic face centered
  • Electron Configuration:
    1s2 2s2p6 3s2p6 4s2
  • Electrons per Energy Level: 2,8,8,2
    Shell Model
  • Ionic Radius: 0.99Å
  • Filling Orbital: 4s2
  • Number of Electrons (with no charge): 20
  • Number of Neutrons (most common/stable nuclide): 20
  • Number of Protons: 20
  • Oxidation States: 2
  • Valence Electrons: 4s2
    Electron Dot Model

Chemical Properties of Calcium

  • Electrochemical Equivalent: 0.7477g/amp-hr
  • Electron Work Function: 2.87eV
  • Electronegativity: 1 (Pauling); 1.04 (Allrod Rochow)
  • Heat of Fusion: 8.54kJ/mol
  • Incompatibilities:
    water, oxidizers, acids, air, chlorine, chlorine tri-fluoride, fluorine, oxygen, silicon, sulfur
  • Ionization Potential
    • First: 6.113
    • Second: 11.871
    • Third: 50.908
  • Valence Electron Potential (-eV): 29

Physical Properties of Calcium

  • Atomic Mass Average: 40.078
  • Boiling Point: 1757K 1484°C 2703°F
  • Coefficient of lineal thermal expansion/K-1: 22E-6
  • Conductivity
    Electrical: 0.298 106/cm Ω
    Thermal: 2.01 W/cmK
  • Density: 1.55g/cc @ 300K
  • Description:
    silvery, soft metal, tarnishes to grayish white after exposure to air.
  • Elastic Modulus:
    • Bulk: 17/GPa
    • Rigidity: 7.4/GPa
    • Youngs: 20/GPa
  • Enthalpy of Atomization: 184 kJ/mole @ 25°C
  • Enthalpy of Fusion: 8.54 kJ/mole
  • Enthalpy of Vaporization: 150 kJ/mole
  • Flammablity Class: Flammable solid
  • Freezing Point:see melting point
  • Hardness Scale
    • Brinell: 167 MN m-2
    • Mohs: 1.75
  • Heat of Vaporization: 153.6kJ/mol
  • Melting Point: 1112K 839°C 1542°F
  • Molar Volume: 26.02 cm3/mole
  • Physical State (at 20°C & 1atm): Solid
  • Specific Heat: 0.632J/gK
  • Vapor Pressure = 254Pa@839°C

Regulatory / Health

  • CAS Number
    • 7440-70-2
  • RTECS: EV8040000
  • NFPA 704
    • Health: 1
    • Fire: 1
    • Reactivity: 2
    • Special Hazard:
  • OSHAPermissible Exposure Limit (PEL)
    • No limits set by OSHA
  • OSHA PEL Vacated 1989
    • No limits set by OSHA
  • NIOSHRecommended Exposure Limit (REL)
    • No limits set by NIOSH
  • Levels In Humans:
    Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.
    • Blood/mg dm-3: 60.5
    • Bone/p.p.m: 170000
    • Liver/p.p.m: 100-360
    • Muscle/p.p.m: 140-700
    • Daily Dietary Intake: 600-1400 mg
    • Total Mass In Avg. 70kg human: 1 kg

Who / Where / When / How

Valence
  • Discoverer: Sir Humphrey Davy
  • Discovery Location: London England
  • Discovery Year: 1808
  • Name Origin:
    Latin: calx, calcis (lime).
  • Abundance of Calcium:
    • Earth's Crust/p.p.m.: 41000
    • Seawater/p.p.m.: 390
    • Atmosphere/p.p.m.: N/A
    • Sun (Relative to H=1E12): 2240000
  • Sources of Calcium:
    Obtained from minerals like chalk, limestone & marble. Very abundant. Makes up 3.5% of crust. Occurs only in compounds. World production in 2000 was around 112,000,000 tons (CaO). Calcium is mined almost everywhere.
  • Uses of Calcium:
    Used for dehydrating oils, decarburization and desulfurization of iron and its alloys, getter in vacuum tubes. Also used as an alloying agent for aluminum, copper and lead, a reducing agent for beryllium and used in fertilizer, concrete & plaster of paris. Calcium is an essential component shells, bones, teeth and plant structures.
  • Additional Notes:
    Calcium was prepared as lime by the Romans under the name calyx in the 1st century A.D., but the metal was not discovered until 1808. Berzelius and Pontin prepared calcium amalgam by electrolizing lime in mercury. Davy was then successful in isolating the impure metal. Why did it take so long? Calcium is the fifth most abundant metalic element in the earth's crust, but is never found in the elemental form because it is so reactive. It is found in limestone (CaCO3) gypsum (CaSO4. 2H2O) and fluorite (CaF2). Pure calcium is a shiny soft metal that will react violently with water to produce hydrogen.

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References

A list of reference sources used to compile the data provided on our periodic table of elements can be found on the main periodic table page.

Related Resources

Valence Electron - Wikipedia

  • Anatomy of the Atom
    Answers many questions regarding the structure of atoms.
  • Molarity, Molality and Normality
    Introduces stoichiometry and explains the differences between molarity, molality and normality.
  • Molar Mass Calculations and Javascript Calculator
    Molar mass calculations are explained and there is a JavaScript calculator to aid calculations.
  • Chemical Database
    This database focuses on the most common chemical compounds used in the home and industry.

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Kenneth Barbalace. Periodic Table of Elements - Calcium - Ca. EnvironmentalChemistry.com. 1995 - 2021. Accessed on-line: 4/24/2021
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Valence electron configuration for calcium

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