MOST elements on the periodic table are

A) gases

B) metals

C) nonmetals

D) rare earth elements

(Use Graph) The periodic table organizes elements according to INCREASING

A) atomic mass.

B) energy level.

C) atomic number.

D) valence number.

Elements are pure substances. They are organized in the periodic able. Each element has a unique atomic structure and chemical symbol. The chemical symbol is either one or two letters, the first letter of which is capitalized.

Can you identify the elements? Check all the symbols that represents single element.

CO

Ca

Fe

H2O

Si

Ne

1. In a periodic table, there are alkali metals, alkaline earth metals, transition metals, non-metals and noble gases. Also, lanthanides and actinides present in the periodic table are radioactive in nature.

Therefore, MOST elements on the periodic table are metals.

2. Number of protons present in an atom represents the atomic number. On the other hand, sum of number of protons and neutrons represent atomic mass of an atom.

When we move from left to right in a periodic table then there will be increase in number of both protons and neutrons. Hence, the periodic table organizes elements according to INCREASING atomic mass.

3. An atom which contains atoms of only one substance is known as an element.

For example, Ca, Fe, Si and Ne are all elements.

Whereas a substance that contains atoms of two different elements with similar composition is known as a substance.

For example, CO, [tex]H_{2}O[/tex] are compounds.

adioabiola adioabiola · Answer 2 · 2021-11-03T17:40:34+01:00

Most elements in the periodic table are metals.
The periodic table organizes elements according to INCREASING Atomic number.
The elements among the options are: Ca, Fe, Si and Ne.

For question 1:

The periodic table contains a variety of metallic elements which include alkali metals, alkali earth metals, transition metals. Other group of elements are Non-metals, Lanthanides and Actinides.

Ultimately, most elements in the periodic table are metals.

For question 2:

The periodic table of elements arranges all of known chemical elements in an organised array such that Elements are arranged from left to right (periods) and top to bottom (groups) in order of increasing atomic number.

For question 3:

An element is a pure substance consisting only of atoms that are similar. In essence, the atoms all have the same numbers of protons in their nuclei.

Contrary to chemical compounds, chemical elements are not broken down into simpler substances by any chemical reaction.