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olga_2 [115]
2 years ago
8

1.Explain why the reactivity of group 7 decreases as you move down the group. Try to use the sentence starters here: When group

7 elements react, their atoms….
As you move down the group, the outer shells get…

Therefore the force of attraction between the shells and the nucleus is….

This makes attracting an extra electron…​

Chemistry
1 answer:
blsea [12.9K]2 years ago
6 0

Answer:

Explanation:

When group 7 elements react , their atoms  gains  one  electron into their highest occupied  energy level ( outer shell) to form single negative - charged ion .

As you move down the group , the outer shells get increased  i.e an additional electron shell is added  thereby increasing the atomic radius  of the atom.  The electrons in the outer shell move further away from the nucleus as we go down the group .

Therefore the force of  attraction  between the shells and nucleus is decreased .

This makes attracting an extra electron difficult  . And so ability of the atom to attract electron to fill the outermost shell reduces which means the   reactiveness of the atom reduces.

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What is the total number of protons in an atom with the electron configuration 2-8-18-32-18-1.
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The total number of protons in this atom is 79 because an atomic number of an element is equal to the number of protons. Here, the atomic number is 79 after adding the given electronic configuration.

What are Protons?

Every atom has a proton, a subatomic particle, in its nucleus. The particle possesses an electrical charge that is positive and opposite to the electrons.

What is Atom?

A nucleus plus one or more electrons bound to the nucleus make up an atom. The quantity of protons or electrons in an element's atom determines how different it is from other similar elements. The atomic number of an element, which serves as its primary identification, is the sum of its protons or electrons.

What is Electronic configuration?

The arrangement of electrons in atomic or molecular orbitals within an atom, molecule, or other physical structure is known as the electron configuration.

Hence, the total number of protons in this atom is 79, after adding 2 + 8 + 18 + 32 + 18 + 1.

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5 0
11 months ago
What unknown quantity can be calculated after performing a titration? a. volume c. mass b. concentration d. density
sertanlavr [38]
C & B are switched so I'm not sure if that was a typo or not, but the answer is concentration!
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3 years ago
Damage to which of the following would disrupt the process of photosynthesis?
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Collected data consists of:
san4es73 [151]

The number of moles of the magnesium (mg) is 0.00067 mol.

The number of moles of hydrogen gas is 0.0008 mol.

The volume of 1 more hydrogen gas (mL) at STP is 22.4 L.

<h3>Number of moles of the magnesium (mg)</h3>

The number of moles of the magnesium (mg) is calculated as follows;

number of moles = reacting mass / molar mass

molar mass of magnesium (mg) = 24 g/mol

number of moles = 0.016 g / 24 g/mol = 0.00067 mol.

<h3>Number of moles of hydrogen gas</h3>

PV = nRT

n = PV/RT

Apply Boyle's law to determine the change in volume.

P1V1 = P2V2

V2 = (P1V1)/P2

V2 = (101.39 x 146)/(116.54)

V2 = 127.02 mL

Now determine the number of moles using the following value of ideal constant.

R = 8.314 LkPa/mol.K

n = (15.15 kPa x 0.127 L)/(8.314 x 290.95)

n = 0.0008

<h3>Volume of 1 mole of hydrogen gas at STP</h3>

V = nRT/P

V = (1 x 8.314 x 273) / (101.325)

V = 22.4 L

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Protons are positively charged and repel other protons. Which other particle is found in the nucleus and separates protons so th
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Neutrons which doesn't have any charge
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3 years ago
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