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Oliga [24]
3 years ago
8

Read the given expression. Effective nuclear charge = atomic number − X Which of the following explains the identity of X and it

s trends across a period?
Chemistry
1 answer:
antiseptic1488 [7]3 years ago
6 0

Explanation:

X- are the non-valence or shielding electrons in an atom. They are the electrons in an atom which excludes the inner orbital ones.

The valence electrons are the electrons in the outermost shell of an atom.

  Effective nuclear charge = Atomic number - Non-valence electrons.

  • The non-valence electrons are located inside of the main/inner electronic shell.  
  • The valence electrons are located outside the main shell.

For example, Neon:

  Atomic number = 10

  Electronic configuration   1s² 2s² 2p⁶

       Non-valence electrons =  1s² = 2 electrons

       Valence electrons = 2s² 2p⁶ = 8 electrons

The trend of the non-valence electrons across the periodic table:

Down a group, new electronic shells are added, this implies that the non-valence electrons increases down the group.

Across the period, the number of the non-valence electrons stays the same because no additional electronic shells are added.

Learn more:

Effective nuclear charge brainly.com/question/5441986

#learnwithBrainly

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What is cell theory and how is it applied to all living organisms?
ch4aika [34]
Description in biology, cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells.
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6. Identify the number of neutrons in one atom of silicon with an isotopic mass number of 28 amu.
Sholpan [36]

14

Explanation:

The number of neutrons in one atom of silicon with an isotopic mass number of 28amu is 14.

An atom is made up three fundamental sub-atomic particles which are:

  Protons, neutron and electrons

Protons are the positively charged particles in an atom

Neutrons do not carry any charges

Electrons are the negatively charged particles.

In the nucleus of an atom, both protons and neutrons can be found. They are the massive particle in an atom.

  The mass number of an atom = number of protons + number of neutrons

Number of neutrons = mass number - number of protons.

From the periodic table, we know that silicon has an atomic number of 14.

The atomic number is the number of protons in an atom:

         Number of neutrons = 28 - 14 = 14amu

In the atom, we will have 14amu of neutrons in a silicon atom.

learn more:

Number of neutrons brainly.com/question/2757829

#learnwithBrainly

5 0
3 years ago
I need help I know it isnt A
inna [77]
It is B. Thank you later please and do good on the test!
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