The particle that makes the atom an unstable isotope is either excess proton or excess neutron.
Unstable isotopes are isotopes of an element that have an excess of either protons or neutrons in their atomic nucleus, making them prone to undergo radioactive decay.
Radioactive decay is the process by which an unstable atomic nucleus releases energy in the form of radiation to achieve a more stable configuration.
The specific particles that can make an atom an unstable isotope are:
Protons: If an atom has an excessive number of protons in its nucleus, it can become unstable.
Neutrons: Similarly, if an atom has an excessive number of neutrons in its nucleus, it can become unstable.
Thus, the particle that makes the atom an unstable isotope is either excess proton or excess neutron.
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For chemical changes like precipitation, appropriate use of a beaker is to provide space for the precipitate to form and for the color of the precipitate to be distinct.
Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
Thus, appropriate use of a beaker is to provide space for the precipitate to form and for the color of the precipitate to be distinct.
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B. francium and platinum
C. rubidium and zinc
D. barium and mercury
When two or more atoms of the same elements combine to form molecules of a compound, the compound formed is said to be molecular.
Two atoms of an element can become chemicallybonded to form a molecular compound.
For example, two atoms of oxygen combine, the result would be a molecule of oxygen. Two atoms of chlorine combining will result in a molecule of chlorine.
When the combination is that of atoms of different elements, what will result is an ordinary compound.
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1 mol = 6.022 x 10²³ atoms
In order to find how many atoms, dimly multiply the amount of moles you have by 6.022 x 10²³ or Avogadro's number.
So you have 1.75 mol CHC1₃ x (6.022x10²³) = 1.05385 x 10²⁴ atoms of CHCl₃
But now you have to round because of the rules of significant figures so you get 1.05 x 10²⁴ atoms of CHCl₃
B. H2O
C. CaO
D. CH4
Answer:
caO
Explanation:
Among the given options, Calcium Oxide (CaO) contains an ionic bond. This bond is formed through the transfer of two electrons from a calcium atom to an oxygen atom.
The question seeks to identify the compound that contains an ionic bond from the provided options. Ionic bonds are usually formed between metals and non-metals. In these cases, the metal atom donates an electron to the non-metal atom, leading to the formation of a positively charged cation and a negatively charged anion. These oppositely charged ions then attract each other, forming an ionic bond.
Let's look at the options:
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(B) F
(C) O
(D) Ca
(E) Na