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Llana [10]
3 years ago
6

A student hypothesizes that since elements in the same row have the same number of energy levels, they should behave the same in

chemical reactions. Explain why you agree or disagree with this hypothesis.
i'm having a bit of trouble with this question :P
anyone know?
Chemistry
2 answers:
zhenek [66]3 years ago
8 0

Explanation:

When we move across a period then there occurs an increase in the number of electrons of atoms from left to right. These electrons are added to the same sub-shell.

For example, elements present in row 2 will have electrons present in n = 2 which is the highest energy level for row 2 elements.

Hence, there are different number of valence electrons present in the elements of a row.

Whereas when we move down a group then elements have same number of valence electrons. As a result, they tend to show similar chemical properties.

But since, there are no same number of valence electrons in the elements of a row. Hence, they do not show similar chemical properties. Therefore, elements of a row do not behave same in chemical reactions.

Thus, we can conclude that we disagree with the hypothesis given by the student.  

Genrish500 [490]3 years ago
3 0
I disagree with this hypothesis, because, the rows only support how many valence electrons there are, but do not support the chemical reaction. However, the columns do. Each column on the periodic table is one group. These groups share similar chemical properties, and react similarly in reaction. In conclusion, the hypothesis is incorrect.
Hope this helped.
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Compare which element would have larger first ionization energy: an alkali metal in Period 2 or an alkali metal in Period 4?
maria [59]

Answer:

An alkali metal present in period 2 have larger first ionization energy.

Explanation:

Ionization energy:

The amount of energy required to remove the electron from the atom is called ionization energy.

Trend along period:

As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.

Trend along group:

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.

As the size of atom increases the ionization energy from top to bottom also  decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.  Thus alkali metal present in period 2 have larger ionization energy because of more nuclear attraction as compared to the alkali metal present in period 4.

6 0
3 years ago
Which of the following correctly represents the transmutation in which a curium-242 nucleus is bombarded with an alpha particle
Alekssandra [29.7K]

<u>Answer:</u> The chemical equation is written below.

<u>Explanation:</u>

Transmutation is defined as the process in which one chemical isotope gets converted to another chemical isotope. The number of protons or neutrons in the isotope gets changed.

The chemical equation for the reaction of curium-242 nucleus with alpha particle (helium nucleus) follows:

_{96}^{242}\textrm{Cm}+_4^2\textrm{He}\rightarrow _{98}^{245}\textrm{Cf}+_0^1\textrm{n}

The product formed in the nuclear reaction are californium-245 nucleus and a neutron particle.

6 0
4 years ago
Which statement describes the effect of sorting and recombining genes in sexual reproduction?
Setler79 [48]
The fourth option I think
7 0
3 years ago
An alloy of bronze is manufactured by melting 51.2 g of copper with 6.84 g of tin. What is the percent copper in the bronze?
Harlamova29_29 [7]

Answer:

Percentage of copper = 88%

Explanation:

Given data:

Mass of copper = 51.2 g

Mass of tin = 6.84 g

Percentage of copper = ?

Solution:

Formula:

Percentage of copper = mass of copper / total mass × 100

Now we will determine the total mass:

Total mass = mass of copper + mass of  tin

Total mass = 51.2 g + 6.84 g

Total mass = 58.04 g

Now we will calculate the percentage of copper.

Percentage of copper = 51.2 g / 58.04 g × 100

Percentage of copper = 0.88 × 100

Percentage of copper = 88%

5 0
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A chemical property of an element is a property of an element that can only be observed or measure when the chemical property of the element is altered or changed.

Based on this;
The boiling point of bromine is a physical property of bromine.
The high reactivity of bromine with many elements is a chemical property of bromine.
4 0
3 years ago
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