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Structure of Atom: Nucleus and Electron Cloud

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Structure of Atom: Nucleus and Electron Cloud

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Questions and Answers

What is the atomic number of an element with 18 protons?

18 (correct)

Which of the following pairs of elements are isobars?

Hydrogen-1 and Helium-4

Fluorine-19 and Sodium-19 (correct)

Carbon-14 and Nitrogen-14

Oxygen-16 and Neon-16

What is the atomic mass of an element with 8 neutrons and 7 protons?

17.0 amu

15.0 amu

14.0 amu

16.0 amu (correct)

Which of the following elements has the most stable isotope?

Carbon-12 Signup and view all the answers

What is the main component of the electron cloud in an atom?

Electrons Signup and view all the answers

What determines the element's atomic number?

The number of protons Signup and view all the answers

Which type of atomic bond occurs when atoms share electrons to create a stable electron configuration?

Covalent bonds Signup and view all the answers

In an ionic bond, what happens to create a positive and negative ion?

Atoms lose or gain electrons Signup and view all the answers

What is the central part of an atom that contains protons and neutrons?

Nucleus Signup and view all the answers

What is the primary cause of the conductivity of metals?

The delocalized and freely moving electrons Signup and view all the answers

How do isotopes of an element differ from each other?

They have different atomic masses but the same number of protons Signup and view all the answers

What determines the chemical properties of an element?

The arrangement of valence electrons in the electron cloud Signup and view all the answers

In the periodic table, elements in the same group have the same number of what type of electrons?

Valence electrons Signup and view all the answers

What is responsible for holding atoms together in metallic bonds?

The electromagnetic force Signup and view all the answers