Quick Answer: What Element In Period 2 Has The Least Mass?

What is the period number?

If you are given with the atomic number of an element you can find it’s period number and group number.

The period number is related to the number of electron occupied shells in the element and the period number is linked to its valence electrons..

What elements is under Group 2 Period 3?

Contents2.1 Sodium.2.2 Magnesium.2.3 Aluminium.2.4 Silicon.2.5 Phosphorus.2.6 Sulfur.2.7 Chlorine.2.8 Argon.

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 does Period 2 have in common?

Like PERIODic table.). All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons.

Which is the shortest period?

first periodThe first period of the periodic table is the shortest period of the periodic table. The sixth period of the periodic table is the longest period of the periodic table.

What is the heaviest noble gas?

RadonRadon has a density of around 4.4 grams per cubic centimeter. Most sources consider this element to be the heaviest noble gas.

Which pair of elements are in the same period?

Sodium and chlorine are in same period.

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.

How many elements are there in second period?

8 elementsThe first period of the periodic table is a short one consisting of only two elements, hydrogen and helium. Lithium, atomic number 3 begins the second period, which has 8 elements. Elements with atomic numbers 4-10, which complete this period, are discussed in this section.

Do periods have similar properties?

All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor. Arranged this way, groups of elements in the same column have similar chemical and physical properties, reflecting the periodic law.

What does the period number tell you?

Period number tells us how many electron shells, or orbits, or energy levels an element has. … Elements are grouped (put into columns) on the periodic table according to their properties.

Which element in the second period has the largest atomic radius?

Atomic 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.

Which two elements would have the same number of energy levels?

Students should realize that each atom in a group has the same number of electrons in its outermost energy level. For instance, hydrogen, lithium, sodium, and potassium all have 1 electron on their outer energy level.

What element has least mass?

hydrogen/helium2. The element with the least atomic mass is (hydrogen/helium).

What are the symbols of the elements in period 2?

8 marks All the elements and their symbols in period 2 are:Lithium (Li), Beryllium (Be), Boron (B), Calcium (C), Nitrogen (N), Oxygen (O),Flourine (F) and Neon (Ne). 3) Write the name and the symbol for the element found in period 3, group 4.

What is period in periodic table?

A period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left. A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements.

Which element in period two has the most mass?

1 Answer. The element in Period 2 with most mass is clearly the element with the highest atomic number, Z , and that is Ne , Z=10 , 21.08⋅g⋅mol−1 .

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.