Question

Write the names and symbols of the elements with the following atomic numbers: a. 1 b. 11 c. 19 d. 82 e. 35 f. 47 g. 15 h. 2

Short answer

H, Na, K, Pb, Br, Ag, P, He

Step-by-step solution

Identify the Periodic Table

First, locate the periodic table, which lists all the chemical elements in order of their atomic numbers. This will be your primary reference for finding the elements corresponding to the given atomic numbers.

Find Element with Atomic Number 1

The element with atomic number 1 is Hydrogen. Its symbol is H.

Find Element with Atomic Number 11

The element with atomic number 11 is Sodium. Its symbol is Na.

Find Element with Atomic Number 19

The element with atomic number 19 is Potassium. Its symbol is K.

Find Element with Atomic Number 82

The element with atomic number 82 is Lead. Its symbol is Pb.

Find Element with Atomic Number 35

The element with atomic number 35 is Bromine. Its symbol is Br.

Find Element with Atomic Number 47

The element with atomic number 47 is Silver. Its symbol is Ag.

Find Element with Atomic Number 15

The element with atomic number 15 is Phosphorus. Its symbol is P.

Find Element with Atomic Number 2

The element with atomic number 2 is Helium. Its symbol is He.

Key concepts

Atomic Number

The atomic number of a chemical element is a fundamental property. It represents the number of protons found in the nucleus of an atom. Each element has a unique atomic number. This number determines the identity of the element and its position in the Periodic Table. For example, Hydrogen has an atomic number of 1, meaning it has one proton. Sodium, with an atomic number of 11, has eleven protons. Understanding atomic numbers is crucial because they directly relate to the structure and properties of the element.

Element Symbols

Element symbols are abbreviated forms used to represent chemical elements easily. Typically, these symbols are one or two letters. The first letter is always a capital letter, while the second letter, if present, is lowercase. For instance:

• Hydrogen - H
• Sodium - Na

Some symbols stem from their Latin names. This is why some symbols do not match their English names. For example:

• Sodium (Natrum) - Na
• Potassium (Kalium) - K

Knowing the symbols for each element is a basic yet essential part of learning chemistry.

Chemical Elements

Chemical elements are pure substances consisting of only one type of atom. Each element has unique characteristics and properties. They are the building blocks of all matter in the universe. The Periodic Table organizes these elements based on their atomic number, electron configurations, and recurring chemical properties. Here are the elements from the exercise:

• 1 - Hydrogen (H)
• 11 - Sodium (Na)
• 19 - Potassium (K)
• 82 - Lead (Pb)
• 35 - Bromine (Br)
• 47 - Silver (Ag)
• 15 - Phosphorus (P)
• 2 - Helium (He)

Understanding these elements and their properties helps us comprehend the composition and behavior of matter.