Question

What element is represented [Kr]5s1?

Answer 1

Well if it's a neutral element, the element is

rubidium.

Explanation:

Look at a copy of the the Periodic Table, and look at the 4th and 5th Periods. Krypton is an inert gas that ends a Period; rubidium is an alkali metal that begins the next Period, the 5th Period.

In practice, we don't even have to know about electronic configuration.

K

r

has

Z

=

36

; add an electron, and a nuclear proton (and possibly a few more neutrons), we get

Z

=

37

, the

atomic number

of

rubidium

.

Claro?

Answer 2

The element that is represented as $[Kr]5s^1$ is Rubidium

Explanation:

Electronic configuration is defined as the representation of electrons present in an atom.

Number of electrons are determined by the atomic number of an element.

We are given an electronic configuration as:  $[Kr]5s^1$

Atomic number of krypton = 36

Total number of electrons = 36 + 1 = 37

The element having atomic number as '37' is Rubidium

Learn more about electronic configuration:

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