Answer:
Sodium
Explanation:
The given elements are present in period three.
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.
Sodium is present at the start of period three so its atomic radius is greater while the smallest atomic radius will be of chlorine.
The statements of Dalton atomic theory are
All elements are composed of tiny indivisible particles called atoms.
Atoms of the same element are identical. The atoms of any one element are different from those of any other element
Atoms of different elements can physically mix together or can chemically combine to form compounds
Chemical reactions occur when atoms are separated from each other, joined, or rearranged in a different combination.
Answer:
Na2B4O7 + H2SO4 + 5H2O → 4H3BO3 + Na2SO4
Explanation:
The unbalanced equation is given as;
Na2B4O7 + H2SO4(aq) + H2O → H3BO3(s) + Na2SO4(aq)
Balancing the equation of the reaction involves making sure the number of moles of elements in the reactants to be equal to the number of moles of the element of the products.
The balanced equation is given as;
Na2B4O7 + H2SO4 + 5H2O → 4H3BO3 + Na2SO4
Answer: Be, Ca, Ra
Explanation:
Elements are distributed in groups and periods in a periodic table.
Elements that belong to same groups will show similar chemical properties because they have same number of valence electrons.
Berrylium (Be) , Calcium (Ca) and radon (Rn) are elements which belong to Group 2. They have 4, 20 and 88 electrons respectively and contain 2 valence electrons each and thus can lose two electrons to complete their octet. Thus they will show similar chemical properties.
The chemical reactivity of elements is governed by the valence electrons present in the element.
Dipole-Dipole interaction is the strongest type of intermolecular force between solute and solvent.
<h3>What is Intermolecular Force ?</h3>
Intermolecular force is also called secondary force is the force of attraction between molecules. It acts between ions and atoms.
<h3>What is Dipole-Dipole attraction ?</h3>
A dipole-dipole attraction is a weak attraction. It occurs when the two dipolar molecules interact with each other that means the attractive forces between the negative end of polar molecule and the positive end of another polar molecule.
CH₃Cl and CH₃OCH₃ both are polar in nature so dipole-dipole attraction is present.
Thus from the above conclusion we can say that Dipole-Dipole interaction is the strongest type of intermolecular force between solute and solvent.
Learn more about the Dipole-Dipole here: brainly.com/question/9279925
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