# Quick Answer: How Do You Find The Period Number?

## What does the mass number tell you?

The mass number of an atom is its total number of protons and neutrons.

Atoms of different elements usually have different mass numbers , but they can be the same.

For example, the mass number of argon atoms and calcium atoms can both be 40..

## Who named Oxygen?

Antoine-Laurent LavoisierIn 1775–80, French chemist Antoine-Laurent Lavoisier, with remarkable insight, interpreted the role of oxygen in respiration as well as combustion, discarding the phlogiston theory, which had been accepted up to that time; he noted its tendency to form acids by combining with many different substances and accordingly …

## What is a group number?

Group Number Each employer that purchases a health plan for its employees also has a number. This group number identifies the specific benefits associated you your employer’s plan. Healthcare providers use the group number plus your member ID number to file claims for your care.

## What is group number and period Number?

Groups and periods are two ways of categorizing elements in the periodic table. Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.

## What is a group number of an element?

In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the f-block columns (between groups 3 and 4) are not numbered. … For example, group 16 is also described as the “oxygen group” and as the “chalcogens”.

## What is the 8th element?

Oxygen is the 8th element of the periodic table of elements.

## How do you predict a group number?

The group of an element is predicted from the number of electrons in the valence shell or/and penultimate shell as follows: a)For s block elements ,group number is equal to the number of valence electrons. b) For p block elements ,group number is equal to 10+number of electrons in the valence shell.

## What are the 7 periods of the 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.

## How do you find the atomic number and period of a group?

First take the Atomic number of the given element. … Then calculate the electronic configuration using the atomic number 2+8+7=17 therefore the electronic configuration will be 2, 8, 7.Here we find that the no of valence electrons of element is 7 as the valence shell has 7 electrons.More items…

## What is the period number of oxygen?

2Fact boxGroup16Melting pointPeriod2Boiling pointBlockpDensity (g cm−3)Atomic number8Relative atomic massState at 20°CGasKey isotopes2 more rows

## What does the group number tell us?

The group number in the periodic table represents number of valence electrons of the elements in a certain group. For example, all the elements in Group−1 have 1 electron in their outer most shell.

## What period have the same features?

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.

## Whats is a period?

Simply put: A period is when a woman’s body releases tissue it no longer needs. This tissue comes from the uterus, which is where a baby (fetus) can develop in the female body. Every month or so, the uterus lining gets thicker to prepare for a fertilized egg if the woman becomes pregnant.

## What is Oxygen’s enemy?

Mercury. Mercury is a big – headed egotistical member of the Metal Men. However, he can be very useful to the team, particularly in his liquid form.

## What is period and group in periodic table?

All the different elements are arranged in a chart called the periodic table. the horizontal rows are called periods. … the vertical columns are called groups. elements in the same group are similar to each other.

## What does the period Number?

When you look at the periodic table, each row is called a period (Get it? … 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.

## What do periods in periodic table represent?

The classic Periodic Table organizes the chemical elements according to the number of protons that each has in its atomic nucleus. … Each row represents one period; the period number of an element indicates how many of its energy levels house electrons.