Atomic Structure Basics

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What is the definition of an atom?

A unit of measurement for elements

A combination of different subatomic particles

The smallest unit of matter that still holds the properties of an element (correct)

A type of matter that has mass and takes up space

How many elements are there in total?

200

118 (correct)

50

10

What is the approximate size of an atom?

$10^{-2}$ meters

$10^{-5}$ meters

$10^{3}$ meters

$10^{-10}$ meters (correct)

Which subatomic particle is positively charged?

Protons Signup and view all the answers

What is the mass of a proton in atomic mass units (amu)?

$1$ amu Signup and view all the answers

How many main types of subatomic particles are there?

3 Signup and view all the answers

Why are atomic mass units (amu) used to measure subatomic particles?

Grams are not practical for measuring such small particles Signup and view all the answers

What defines an atom as a specific element?

Number of protons Signup and view all the answers

Which subatomic particle has a negative charge?

Electrons Signup and view all the answers

What type of bond is formed when two atoms share electrons?

Covalent bond Signup and view all the answers

Which subatomic particle's number can change during nuclear reactions?

Protons Signup and view all the answers

What is the total mass of an atom equal to?

Number of neutrons multiplied by the number of protons Signup and view all the answers

Which subatomic particle is located in the nucleus and has no charge?

Neutrons Signup and view all the answers

What do atoms with a different number of neutrons than average become known as?

Isotopes Signup and view all the answers

What determines an element's position in the periodic table?

Atomic number Signup and view all the answers

Atomic Structure Basics

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