Atomic Masses and Electronic Configuration of First 30 Elements

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Questions and Answers

What information does the document provide about the elements?

Isotopic compositions
Molecular weights and molar masses
Bonding tendencies and electronegativities
Atomic numbers, element symbols, and atomic masses (correct)

Which shells are mentioned in the document for electron distribution?

X, Y, Z
P, Q, R
A, B, C
K, L, M, N (correct)

What is rounded off to the nearest whole number or half number?

Atomic radius
Atomic mass (correct)
Ionization energy
Electron affinity

Which of the following elements is specifically mentioned in the table?

<p>Carbon (D)</p> Signup and view all the answers

What is NOT included in the document about the elements?

<p>Boiling points (D)</p> Signup and view all the answers

Flashcards

Atomic Number

The number of protons in an element's nucleus.

Element Symbols

Abbreviations used to represent elements, often derived from their names.

Atomic Mass

The weighted average mass of an element's isotopes, rounded to whole or half numbers.

Electron Shells

Layers around an atom's nucleus where electrons are distributed.

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Carbon

A non-metal element essential for life, with the symbol C.

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Study Notes

Atomic Masses of First 30 Elements

The document lists the atomic numbers, element symbols, and atomic masses of the first 30 elements.
The atomic mass of each element is rounded off to the nearest whole number or half number.
The document includes common elements such as:
- Hydrogen
- Helium
- Carbon
- Oxygen
- Sodium
- Magnesium
- Zinc
The electronic configuration of the elements is shown, including the distribution of electrons in the:
- K shell
- L shell
- M shell
- N shell

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Description

Explore the atomic numbers, element symbols, rounded atomic masses, and electron distribution of the first 30 elements in this valuable reference document. From hydrogen to zinc, familiarize yourself with the properties of these fundamental elements.