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V125BC [204]
2 years ago
8

An atom of element X has one more shell of electrons than an atom of beryllium, but it has one less valence electron than beryll

ium. Which element is element X?
sodium (Na)
boron (B)
magnesium (Mg)
lithium (Li)
Chemistry
2 answers:
zavuch27 [327]2 years ago
5 0

Correct answer choice is :


A) sodium (Na)


Explanation:


It's a light element, reactive and with a low melting point, with a corresponding density of 0,97 at 20ºC. From the business point of view, sodium is the most significant of all the alkali elements. Sodium acts immediately with water, and also with snow and ice, to create sodium hydroxide and hydrogen.


Eddi Din [679]2 years ago
3 0
Sodium has three shells of electrons instead of two and has one electron in its valence shell. Beryllium has two in its valence shell.

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What is the kinetic energy of the emitted electrons when cesium is exposed to UV rays of frequency 1.3×1015Hz?
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Answer:

We know that

ħf = ф + Ekmax  

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Answer:

5.19x10^-19 J  

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Answer details:

Subject: Chemistry

Level: College

Keywords:

• Energy  

• Kinetic energy

• Kinetic energy of emitted electrons

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