19 K Potassium 39.098 u

Potassium

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คาบ
4
หมู่
1
บล็อก
s-บล็อก
สถานะ (STP)
Solid

Potassium is an essential alkali metal for all living cells. It is the seventh most abundant element in Earth's crust.

ลักษณะ: Silvery-gray

About Potassium

Essential to every living cell, potassium is a soft, silvery alkali metal that reacts vigorously with water. It has atomic number 19 and an atomic mass of 39.098, a notably large atomic radius of 243 pm, and a low melting point of 337 K. Its single valence electron ([Ar] 4s1) is loosely held, giving the low electronegativity of 0.82 and a first ionization energy of just 419 kJ/mol. Humphry Davy first isolated the metal in 1807. Potassium is the seventh most abundant element in Earth's crust, but its reactivity means it never occurs free. It belongs to group 1, period 4.

คุณสมบัติทางกายภาพ

มวลอะตอม 39.098 u
ความหนาแน่น 0.862 g/cm³
จุดหลอมเหลว 63.6 °C
จุดเดือด 758.9 °C
สถานะที่ STP Solid
รัศมีอะตอม 243.0 pm

คุณสมบัติทางอิเล็กทรอนิกส์

อิเล็กโทรเนกาติวิตี 0.82
พลังงานไอออไนเซชัน 418.8 eV
อิเล็กตรอนแอฟฟินิตี 48.4 eV
อิเล็กตรอนวาเลนซ์ 1

การจัดเรียงอิเล็กตรอน

การกำหนดค่า [Ar] 4s¹

Electron Shell Configuration

Potassium electron shell configuration K 2e⁻ 8e⁻ 8e⁻ 1e⁻
Electron shell structure of Potassium — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 8
3 (M) 8
4 (N) 1

Position in Periodic Table

Potassium position in the periodic table K

การค้นพบ

ค้นพบโดย: Humphry Davy
ปี: 1807

Compounds Containing Potassium

Frequently Asked Questions

What is Potassium?
Potassium (K) is a chemical element with atomic number 19. It is a solid at standard temperature and pressure, classified as a โลหะแอลคาไล.
What are the key properties of Potassium?
Potassium has an atomic mass of 39.098 u, density of 0.862 g/cm³, melting point of 63.6°C, boiling point of 758.9°C.
What is the electron configuration of Potassium?
The electron configuration of Potassium is [Ar] 4s1. It is in the s-block of the periodic table.
Who discovered Potassium?
Potassium was discovered by Humphry Davy in 1807.
What is the electronegativity of Potassium?
Potassium has an electronegativity of 0.82 on the Pauling scale.