# What repeats when elements are arranged in order of increasing atomic mass?

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Mendeleev saw that when the elements were arranged in order of increasing atomic mass, those that had similar properties fell into a repeating pattern. That is, the pattern was periodic. Periodic means “happening at regular intervals.” The days of the week are periodic. They repeat in the same order every seven days.

## What is the pattern of the elements on the periodic table?

The elements are arranged in seven horizontal rows, in order of increasing atomic number from left to right and top to bottom. The rows are called periods, and they are numbered from 1 to 7.

## What effect did the discovery of gallium?

What effect did the discovery of gallium have on the acceptance of Mendeleev’s table? The close match between the predicted properties and the actual properties of gallium helped gain wider acceptance for Mendeleev’s periodic table.

## When elements are arranged in order of increasing atomic number there is a periodic repetition of their chemical and physical properties?

States that when the elements are arranged by increasing atomic number, there is a periodic repetition of their properties. A vertical column of elements in the periodic table arranged in order of increasing atomic number; also called a family. You just studied 21 terms!

## What name is given for the repeating pattern that arises from the arrangement of the elements in order of increasing atomic number?

In 1864, with about 50 elements known, the British chemist John Newlands noticed a pattern when he arranged the elements in order of atomic mass, or weight. He found that the properties of the elements seemed to repeat every eighth element. He called this the Law of Octaves, comparing it to musical scales.

## What are the groups in Mendeleev’s table?

Groups and Periods Mendeleev discovered that if he placed eight elements in each row and then continued on to the next row, the columns of the table would contain elements with similar properties. He called the columns groups.

## How many groups and periods does Mendeleev have?

-There are a total of 8 groups and 7 periods in the modified Mendeleev table. -There are a total of 18 groups and 7 periods in the modern periodic table that is followed worldwide now. Clearly, the answer is (D).

## What are the 7 groups of the periodic table?

The Elements displayed in each Periodic Table Group are either Gas, Liquid or Solid at room temperature and are classified in groups as: Alkali Metals, Alkaline Earth Metals, Transition Metals, Metalloids, Other Metals, Non-metals, Halogens, Noble Gases and Rare Earth Elements.

## How is Mendeleev’s periodic table arranged?

In his periodic table, Mendeleev arranged elements in rows by increasing atomic mass. Within a row, elements with lower atomic masses were on the left. Thus, all the elements in a column had similar properties. Each row of Mendeleev’s periodic table represented a repeating pattern.

## What is another name for Group 0?

The elements in group 0 are called the noble gases . They exist as single atoms .

## Can you now say why Mendeleev?

Mendeleev developed a Periodic Table of elements wherein the elements were arranged on the basis of their atomic mass and also on the similarity on chemical properties. He arranged them in increasing order of atomic masses, and observed periodic reoccurance of elements with similar properties.

## Why did Mendeleev leave gaps in his table?

Mendeleev left gaps in his table to place elements not known at the time. By looking at the chemical properties and physical properties of the elements next to a gap, he could also predict the properties of these undiscovered elements.

## Why are there gaps in periodic table?

Gaps in the periodic table were first used by Dimtri Mendeleev when he could not find an element to fit the patterns of the groups and periods he was using. Mendeleev knew there would be undiscovered elements so used these gaps to prompt other scientists to start looking for them.

## Why did Mendeleev reverse the order of these two elements?

Mendeleev’s 1869 periodic table. Mendeleev reversed the order because he knew that the properties of iodine were much more similar to those of fluorine (F), chlorine (Cl), and bromine (Br) than they were to oxygen (O), sulfur (S), and selenium (Se).

## Why is fluorine the most reactive element in Group 7?

Fluorine is the most reactive element in Group 7, and is even more reactive than chlorine. Fluorine’s outer shell is closer to the nucleus and has fewer filled shells between it and the nucleus, so the attraction for a new electron is greater and so it can gain an extra electron more easily.

John Newlands

## What does the group number represent?

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 is group number of elements?

Groups are numbered from 1 to 18. From left to right in the periodic table, there are two groups (1 and 2) of elements in the s-block, or hydrogen block, of the periodic table; ten groups (3 through 12) in the d-block, or transition block; and six groups (13 through 18) in the p-block, or main block.

16

## What’s the group number on a periodic table?

The elements are stacked in such a way that elements with similar chemical properties form vertical columns, called groups, numbered from 1 to 18 (older periodic tables use a system based on roman numerals). Groups 1, 2, and 13–18 are the main group elements, listed as A in older tables.

## What are the names of the 18 groups in the periodic table?

Groups are numbered 1–18 from left to right. The elements in group 1 are known as the alkali metals; those in group 2 are the alkaline earth metals; those in 15 are the pnictogens; those in 16 are the chalcogens; those in 17 are the halogens; and those in 18 are the noble gases.

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