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3 years ago

The atomic number of barium is 56.

1 answer:

7 0

Basic Information
Name: Barium 
Symbol: Ba 
Atomic Number: 56 
Atomic Mass: 137.327 amu 
Melting Point: 725.0 °C (998.15 K, 1337.0 °F) 
Boiling Point: 1140.0 °C (1413.15 K, 2084.0 °F) 
Number of Protons/Electrons: 56 
Number of Neutrons: 81 
Classification: Alkaline Earth
Crystal Structure: Cubic 
Density @ 293 K: 3.51 g/cm3
Color: Silver

Atomic Structure 
Number of Energy Levels: 6
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 18
Fourth Energy Level: 18
Fifth Energy Level: 8
Sixth Energy Level: 2
IsotopesIsotopeHalf LifeBa-130StableBa-13111.7 daysBa-132StableBa-13310.5 yearsBa-133m1.6 daysBa-134StableBa-135StableBa-135m1.2 daysBa-136StableBa-137StableBa-137m2.6 minutesBa-138StableBa-1391.4 hoursBa-14012.8 daysBa-14118.3 minutesBa-14210.7 minutes
Facts
Date of Discovery: 1808 
Discoverer: Sir Humphrey Davy 
Name Origin: From the Greek word barys (heavy) 
Uses: Medical applications, among others 
Obtained From: barytine, whiterite

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2 years ago

Read 2 more answers

Convert 9.32x 10 23ª atoms of au to moles of au

7nadin3 [17]

Answer:

$\huge\boxed{\sf no.\ of\ moles = 1.55\ moles }$

Explanation:

Given:

Number of atoms = $9.32 \times 10^{23}$ atoms

Avogadro's Number = $6.023 \times 10^{23}$ atom / mol

Required:

Moles = ?

Formula:

$\displaystyle No.\ of\ moles = \frac{no. \ of \ atoms }{avogadro's \ no.}$

Solution:

$\displaystyle no. \ of \ moles = \frac{9.32\times 10^{23}}{6.023 \times 10^{23}}$

no. of moles = 1.55 moles

$\rule[225]{225}{2}$

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3 years ago

How do quasars differ from galaxies

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4 years ago

The distance measured between five successive crests of a wave motion executed by a photon of an electromagnetic radiation is 2.

Jet001 [13]

Answer:

6.25 ×10^10 Hz

Explanation:

If the distance between five successive crests is 2.4 cm, then the distance between each crest is 2.4/5 = 0.48 cm or 0.0048 m or 4.8 ×10^-3 m

Since the velocity of a wave is given by;

v= λf

Where;

λ= wavelength of the wave

f= frequency of the wave

But λ= distance between successive crests = 4.8 ×10^-3 m

v= 3×10^8 ms-1 (speed of electromagnetic waves in vacuum)

f= v/λ

f= 3×10^8 ms-1/4.8 ×10^-3 m

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3 years ago