Which element mentioned above is highly reactive?

Reactivity of Group 1 Elements Hydrogen is a very reactive gas, and the alkali metals are even more reactive. In fact, they are the most reactive metals and, along with the elements in group 17, are the most reactive of all elements.

Why is cesium so much more reactive than potassium?

The alkali metals, Group 1A, are the most reactive metals because they have one valence or outer electron. This makes Francium the most reactive, followed by cesium, rubidium, potassium, sodium and lithium. Francium is almost non-existent in nature so cesium is the most reactive metal of those observed.

Why is cesium the most reactive metal in Group 1?

Caesium and Francium are both in group 1, which means that they want to lose their one valence electron VERY badly such that they may achieve the electron configuration of a noble gas. That is what makes group 1 so reactive: they will give their valence electron to anything nearby to achieve their goal.

What is the least reactive element?

Noble gases

Which elements have the highest reactivity?

Reactivity Trend in the Periodic Table

• The most reactive element is fluorine, the first element in the halogen group.
• The most reactive metal is francium, the last alkali metal (and most expensive element).
• The least reactive elements are the noble gases.

Which is the least reactive element in period 3?

Silicon. Silicon (symbol Si) is a group 14 metalloid. It is less reactive than its chemical analog carbon, the nonmetal directly above it in the periodic table, but more reactive than germanium, the metalloid directly below it in the table.

Which family is the most reactive?

halogens

Which is the least reactive element in Period 4?

Copper

Which elements are highly reactive in period 3?

Chlorine, sulfur, phosphorus, and silicon are all strongly oxidizing… And that’s seven out of eight elements……..

What element in Period 2 is the most active metal?

Fluorine is the most reactive of all elements, and it even attacks many oxides to replace oxygen with fluorine. Fluorine even attacks silica, one of the favored materials for transporting strong acids, and burns asbestos.

How do you know that potassium an alkali metal is highly reactive?

The alkali metals, Group 1A, are the most reactive metals because they have one valence or outer electron. They lose this electron very easily, forming ions with a charge of +1. This same strong reactivity because of one valence electron is true of potassium, as well.

What is the 2 8 8 rule in chemistry?

There is a 2-8-8 rule for these elements. The first shell is filled with 2 electrons, the second is filled with 8 electrons, and the third is filled with 8. You can see that sodium (Na) and magnesium (Mg) have a couple of extra electrons. They, like all atoms, want to be happy.

Why third period has only 8 elements not 18?

The electron capacity of third shell is 18. So the third period should actually contain 18 elements. But it contains only 8 elements due to the law of electron octet. This is because of the fact that electrons are filled in these shells in the increasing order of electrons.

Why is 3rd shell 8 or 18?

The third shell of an atom has 18 electrons only not 8 electrons. You might be confused because first the electrons of 4s are filled and then the 10 electrons of 3d shells are filled. They are filled because of the n-l rule.

Why are there 18 electrons in the third shell?

Each shell can contain only a fixed number of electrons, up to two electrons can hold the first shell, up to eight (2 + 6) electrons can hold the second shell, up to 18 (2 + 6 + 10) can hold the third shell and so on. The general formula is that the nth shell can hold up to 2(n2) electrons in principle.

Is it 8 or 18 electrons in third shell?

In this sense the third shell can hold 8 electrons. In this sense the third shell can hold a total of 18 electrons. So the third shell can be considered to hold 8 or 18 electrons but in total the third shell can hold 18 electrons.

Why are there only 8 electrons in the outer shell?

This is due to the quantum nature of the atoms, where electrons are arranged into shells: there are 2 electrons in the first called the K shell, 8 in the second (L-shell), 18 in the third (M shell). …

Why can an atom only have 8 valence electrons?

Why? Referring to the octet rule, atoms attempt to get a noble gas electron configuration, which is eight valence electrons. Sodium has one valence electron, so giving it up would result in the same electron configuration as neon. Chlorine has seven valence electrons, so if it takes one it will have eight (an octet).

Why do electrons want a full outer shell?

To attain stable electronic configuration they they try to have full the outermost orbit or valence orbit. This is done by losing or gaining electrons. the answer for your question is simple. To attain stable electronic configuration they they try to have full the outermost orbit or valence orbit.

What has an atomic number of 8?

Oxygen

Which elements have a complete outer shell?

Helium(He), Neon(Ne) and Argon(Ar) all had complete outer shells.

Why are full electron shells more stable?

The properties of an element are determined by its outermost electrons, or those in the highest energy orbital. Atoms that do not have full outer shells will tend to gain or lose electrons, resulting in a full outer shell and, therefore, stability.

Which is the smallest unit of matter?

Atom

Do atoms want to be neutral?

Atoms are electrically neutral because they contain equal quantities of positively charged protons and negatively charged electrons. Electrons and protons have equal but opposite charges, so the result is no net charge. Ions are atoms that have gained or lost electrons. As a result, ions have a net charge.

Why does the second shell have more electrons than the first?

Atoms have the same number of protons as they do electrons. Generally, the first shell of an atom must be filled first, the second shell is then filled, and so on. The number of electrons allowed in each shell follows two rules: The furthest shell to be filled can never contain more than eight electrons.