# What is period and group?

A period is a horizontal row of the periodic table. A group is a vertical row of the periodic table.

## What is the period definition in science?

Scientific definitions for period period. [ pĭr′ē-əd ] A division of geologic time that is longer than an epoch and shorter than an era. The duration of one cycle of a regularly recurring action or event. See also cycle frequency.

## What are the 7 periods of periodic table?

These families are alkali metals, alkaline earth metals, transition metals, post-transition metals, metalloids, halogens, noble metals, and noble gases.

## What is the period number?

The period number on the Periodic table tells you the total number of orbits that the atom will have. In other words, the period number indicates the number of energy levels (or energy orbit) of an atom. For example, 1st period indicates that these elements possess 1 energy shell (or energy orbit).

## Why is it called a period?

“Period” is rooted in the Greek words “peri” and “hodos” (periodos) meaning “around” and “way/path.” This eventually turned into the Latin “periodus” meaning “recurring cycle.” Use of the English term “period” to describe menstruation began in the early 1800s (1).

## What is the unit of period?

The unit for time period is ‘seconds’. Frequency and time period are in a reciprocal relationship that can be expressed mathematically as: T = 1/f or as: f = 1/T. Orbital period is the time for something to go round (orbit) something else.

## What is the formula for period?

… each complete oscillation, called the period, is constant. The formula for the period T of a pendulum is T = 2π Square root of√L/g, where L is the length of the pendulum and g is the acceleration due to gravity.

## How many periods are there?

Between the ages of 12 and 52, a woman will have around 480 periods, or fewer if she has any pregnancies.

## What is Group 17 called?

The halogens are located on the left of the noble gases on the periodic table. These five toxic, non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

## What element is in Period 3?

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.

## How do you write the period of a number?

The period name is written above each period. To write a whole number in standard form, write the number named in each period, and replace each period name with a comma. 5,913,603,800 is read “five billion, nine hundred thirteen million, six hundred three thousand, eight hundred.”

## Which element is in period 4 group 2?

This is the element zirconium , Zr .

## When was it called a period?

The year 1985 is probably the first time in media history that the word period was first used.

## Why do girls have periods?

As a woman, your period is your body’s way of releasing tissue that it no longer needs. Every month, your body prepares for pregnancy. The lining of your uterus gets thicker as preparation for nurturing a fertilized egg. An egg is released and is ready to be fertilized and settle in the lining of your uterus.

## Who discovered periods?

Theories suggest that ancient Egyptians used a ‘tampon’ made of papyrus fibres. It’s also suggested that Ancient Greeks used a wood wrapped in lint! These are theories but it gives you an idea of the inventive methods used to control menstrual flow.

## What is the symbol for period?

Alternatively referred to as a full stop or dot, a period ( . ) is a punctuation mark commonly found on the same US QWERTY keyboard key as the greater than ( > ).

## What is time period and frequency?

Frequency definition states that it is the number of complete cycles of waves passing a point in unit time. The time period is the time taken by a complete cycle of the wave to pass a point.

## Is period and wavelength the same?

Wavelength and period are two different, but related properties of waves. The main difference between wavelength and period is that the wavelength is the shortest distance between two successive points on a wave that are in phase while period is the time taken for a complete oscillation to take place at a given point.

## How long is a period?

Your period, also known as menstruation, typically lasts anywhere from two to eight days. Many women experience symptoms during their period. Certain symptoms like cramping or mood changes can begin before the actual period.

## Can I get pregnant on my period?

A woman’s ovulation cycles can vary, so it’s statistically possible you could become pregnant while on your period. While pregnancy is less likely in the earlier days of your period, the chances increase in the later days.

## Can a pregnant woman see her period?

Intro. The short answer is no. Despite all of the claims out there, it isn’t possible to have a period while you’re pregnant. Rather, you might experience “spotting” during early pregnancy, which is usually light pink or dark brown in color.

## What is Group 16 called?

The group 16 elements of the modern periodic table consist of 5 elements oxygen, sulphur, selenium, tellurium and polonium. The elements in this group are also known as the chalcogens or the ore-forming elements because many elements can be extracted from sulphide or oxide ores.

## What are Group 18 elements called?

noble gas, any of the seven chemical elements that make up Group 18 (VIIIa) of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).

## What are Group 15 elements called?

nitrogen group element, any of the chemical elements that constitute Group 15 (Va) of the periodic table. The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), bismuth (Bi), and moscovium (Mc).