 # Quick Answer: What Number Increases From 3/10 To Period 2?

## What number increases from 3/10 to Period 2?

In the periodic table, atomic number increases from 3 to 10 in period 2.

Explanation: Atomic numnber is the total number of protons present in an atom.

And, when we move across a period then there occurs an increase in atomic number of the elements..

## How many elements are there in the 2nd period?

8 elementsBased on the atomic number of the atom the electrons are filled in the shell. Each shell represents a period of a periodic table. So, as the second shell consists of 8 electrons and it is considered as a period in the table, the second period consists of 8 elements.

## Where is period 2 on the periodic table?

The horizontal rows of the periodic table are called periods. Period 2, or the second period, refers to the second row from the top of the periodic table.

## What is the trend in melting point for Period 2?

The melting points and boiling points tend to peak in the middle of Periods 2 and 3 (Groups 3/13 and 4/14) and the lowest values at the end of the period – the Noble Gases.

## Which group has largest atomic radius?

franciumAtomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.

## What happens to the ionic radius values of the cations (+) as you move across Period 2?

Ionic radii decreases across a period. This is due to the fact that metal cations lose electrons, causing the overall radius of an ion to decrease. … This is because the number of protons in the nucleus increases across the period. That causes attraction to bonding pairs of electrons more strongly.

## Why does the second period have 8 elements?

There are 8 elements in period 2 because all those elements have electrons in the second shell and no electrons in the third shell.

## Does Period 3 have 5 valence electrons?

The element that has three energy levels and five valence electrons in its outer level is phophorous, atomic number 15. … Phosphorous is the 5th element from the left in the third period so it has five valence electrons.

## What is the period for plutonium?

Fact boxGroupActinides640°C, 1184°F, 913 KPeriod73228°C, 5842°F, 3501 KBlockf19.7Atomic number94State at 20°CSolid238Pu, 239Pu, 240Pu2 more rows

## What is the trend in atomic radius across Period 2?

– The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. Therefore, the atomic radius increases as the group and energy levels increase. 2) As you move across a period, atomic radius decreases.

## What is period 2 on the periodic table?

The second period contains the elements lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon. In a quantum mechanical description of atomic structure, this period corresponds to the filling of the second (n = 2) shell, more specifically its 2s and 2p subshells.

## What is Period 3 on the periodic table?

The third period contains eight elements: sodium, magnesium, aluminium, silicon, phosphorus, sulfur, chlorine, and argon. The first two, sodium and magnesium, are members of the s-block of the periodic table, while the others are members of the p-block.

## Why does Period 1 only have 2 elements?

There are only two elements in the first period: hydrogen and helium. … This is because in quantum physics, this period fills up the 1s orbital. Period 1 elements follows the duet rule, they only need two electrons to complete their valence shell. These elements can only hold two electrons, both in the 1s orbital.

## What element is in Period 2 Group 7?

Group 7A (or VIIA) of the periodic table are the halogens: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

## Why does the 3rd period have 8 elements?

According to the 2n2 rule, the maximum number of electrons in the third period = 2 x (3)2 = 18. But, the last shell cannot accommodate more than 8 electrons so, the number of electrons in third period is 8. Hence, the number of elements is also 8.

## What element is in Group 2 Period 4?

calciumThe given element is calcium.

## Which element in Period 2 has the largest atomic radius?

Element Li(A) Trends in the Atomic Radius of Elements in Period 2ElementLiBeEnergy Level being filled (Valence Shell)second (L)second (L)Nuclear Charge (charge on all protons)3+4+Atomic Radius (pm)13490General Trend(largest)→1 more row

## What element in Period 2 has the least mass?

LithiumExplanation: Lithium has the least mass, while Neon has the most mass. Lithium: The elements in Period 2 of the periodic table are: Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, and Neon.

## Why is 7th period incomplete?

7th period is considered incomplete because it consists of elements which have not been studied properly yet. … Thus, we can’t give them a permanent recognition as all the elements in the periodic table have many properties and similarities to follow.

## Why is chlorine in period 3?

From sodium to chlorine, the bonding electrons are all in the 3-level, being screened by the electrons in the first and second levels. The increasing number of protons in the nucleus as you go across the period pulls the bonding electrons more tightly to it.

## Which element is most positive?

The alkali metals are the most electropositive. Cesium is the most electropositive of the stable elements. Francium, while unstable, is theoretically the most electropositive element. Electropositivity increases down groups and decreases along periods (from left to right) on the periodic table.