What element has a shorthand configuration of [He]2s^22p^1

Chemistry

1 answer:

nlexa [21]4 years ago

3 0

Boron

You start at He and work you way down

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Which formation is one feature of karst topography?

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What’s the frequency of radiation that has a wavelength of 13 um, about the size of bacterium?

choli [55]

Answer:

2.3)X10^13-Hz

Explanation:

What’s the frequency of radiation that has a wavelength of 13 um, about the size of bacterium?

a micro meter is 10^-6 meter

frequency of light times wavelength = c the speed of light 3X10^8 M/sec

frequency times 13 X10^-6 =3X10^8 M/

FR3EQUENCY = 3X10^8/13X10-6

=(30/13)10^13 =2.3)X10^13-Hz

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A new substance with unique chemical and physical properties formed when two or more elements are chemically bonded during a phy

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A compound

Explanation:

Chemical compound can be regarded as any substance made up of identical molecules which consists atoms of two or more than two chemical elements. For example four hydrogen atoms bonds with a carbon atom to give methane molecule which is a compound. It should be noted that A compound is a new substance with unique chemical and physical properties formed when two or more elements are chemically bonded during a physical reaction.

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3 years ago

A metallurgist has a 42.0-gram sample of an object of unknown composition. On testing it, the metallurgist finds that it takes 2

emmasim [6.3K]

Answer: The object's heat of fusion is 68.52 Joules/gram.

Explanation:

Mass of the sample = 42 grams

Energy required to melt the sample completely = 2878 Joules

$Q=m\times\Delta H_{fusion}$