Which of the following has three electrons in its valence shell? carbon aluminum sodium calcium

2 answers:

6 0

Aluminum has 3 valence electrons.
<span>You can figure out the valence electrons by looking at its group number. Aluminum is in group 3, so it has 3 valence electrons. </span>

Tanya [424]3 years ago

6 0

Answer:

Aluminium

Explanation:

Electrons in an atom will spin around the nucleus at very high speeds. They are negatively charged particles, so they will be attracted to the nucleus (a positive charge), but they will repel other electrons. They form orbital levels (or another name would be valence shells), so that they will not collide with each other.

In the periodic table, you have groups 1 through to 18, and each element has similar properties to the other elements in its group. Group 1 and 17 are the most reactive, because they have one too many (group 1) or one too few (group 17) electrons to make their valence shell a full octet (as can be seen in the noble gasses in group 18). As you go across the groups, group 1 has 1 extra electron, group 2 has 2 extra electrons, group 3 has 3 extra electrons, and so forth.

This means that, if the element has 3 electrons in its valence shell, it will be in group 3, and the only element, out of the given options, in group 3 is aluminium.

Note that it specifies 3 electrons in its valence shell, not 3 electrons overall.

You might be interested in

Balance the equation: ___ SiO2 + ___ HF  ___ SiF4 + ___ H2O

olga_2 [115]

Let's start from the Fluorine (F), which has 4 atoms on the right side: this means we must put a factor 4 in front of HF to balance the number of atoms of Fluorine.
Nowe we have 4 atoms of hydrogen, H, on the left side. Since we have a $H_2$ on the right side (2 atoms), we must put a factor 2 in front of $H_2 O$ , to balance the number of atoms of hydrogen.
So now the atoms of oxygen are also balanced (2 on both sides), as well as the atoms of Silicon (Si), so the balanced reaction is

$Si O_2 + 4 HF \rightarrow SiF_4 + 2 H_2 O$

3 0

3 years ago

An earthquake in San Francisco produces a wave with a period of 0.80 seconds and a wavelength of 40 m., How long will it take fo

gtnhenbr [62]

Answer:

A) 3.11 Hrs

Explanation:

Wave speed is given by the formula

$Speed = \frac{wavelength}{Time\: period}$