Electron Configuration and Valence Electrons

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How many valence electrons does a neutral Cl atom with atomic number 17 have?

5 (correct)

7

8

2

What is the role of valence electrons in determining the chemical properties of an atom/element?

Determining the atomic number

Controlling the electrical conductivity

Controlling the chemical properties and bonding behavior (correct)

Determining the number of electron shells

Why are atoms/ions with a filled outmost shell considered stable?

Due to a higher number of electron shells

Because they have a higher atomic number

They have a stable outmost shell with the required number of electrons (correct)

They exhibit electrical conductivity

Which group of elements in the periodic table tends to accept 2 electrons during bonding?

Alkaline earth metals Signup and view all the answers

What does each row in the periodic table indicate about the elements within that row?

The number of electron shells and subshells Signup and view all the answers

How do similar valence electron structures in columns of the periodic table affect the properties of elements within those columns?

They influence the types of bonds formed by those elements Signup and view all the answers

What is the averaged (over naturally occurring isotope) mass (weight) for one aluminum atom?

$4.48 \times 10^{-23}$ g/mol Signup and view all the answers

According to the Bohr model, what are the different 'orbits' or energy levels that electrons can occupy in an atom?

K, L, M Signup and view all the answers

Which of the following is a correct representation of the electron configuration for a neutral aluminum (Al) atom?

1s^2 2s^2 2p^6 3s^2 3p^1 Signup and view all the answers

What is the relationship between the number of valence electrons and the reactivity of an element?

Elements with fewer valence electrons are more reactive. Signup and view all the answers

What is the Pauli exclusion principle, and how does it apply to the arrangement of electrons in an atom?

No more than two electrons can occupy the same orbital, and they must have opposite spins. Signup and view all the answers

Which of the following is a characteristic of ionic bonds in materials?

They are formed by the complete transfer of electrons from one atom to another. Signup and view all the answers

What is the relationship between the atomic number (Z) and the number of protons in the nucleus of an atom?

The atomic number is equal to the number of protons in the nucleus. Signup and view all the answers

What is the relationship between the atomic mass (A) and the number of protons and neutrons in an atom?

The atomic mass is equal to the number of protons plus the number of neutrons in the nucleus. Signup and view all the answers

Which of the following best describes the concept of an isotope?

Isotopes have the same number of protons but different numbers of neutrons. Signup and view all the answers

How many Al atoms are present, on average, in one gram of aluminum?

$6.022 \times 10^{23}$ Al atoms Signup and view all the answers

What is the relationship between the number of valence electrons and the type of chemical bond formed between atoms?

The number of valence electrons determines the number of bonds an atom can form, which determines the type of bond. Signup and view all the answers

Which of the following statements about the periodic table is correct?

The periodic table is organized by increasing atomic number and decreasing atomic radius. Signup and view all the answers

Electron Configuration and Valence Electrons

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