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The dog is following the scent molecules left behind by the cat. The scent molecules the cat left behind come into contact with the neurons in the dog's nasal passages, and the information is sent to his brain.

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What has the smallest atomic radius Na Mg Cl Al?

The smallest atomic radius is found in Cl (Chlorine), followed by Al (Aluminum), then Na (Sodium), and finally Mg (Magnesium). The trend typically follows an increase in atomic radius from right to left across a period and from top to bottom down a group on the periodic table.


What type of molecule movement consist on one way diffusion across a semi permeable membrane?

The movement of molecules across the semipermeable membrane follows the law of diffusion. Thus, the molecules of a substance move from their higher concentration towards their lower concentration by their own kinetic energy.


What are the acidity and basicity trends of the periodic table?

The acidity and basicity trends on the periodic table are primarily based on the atomic size and electronegativity of elements. Generally, as you move from left to right across a period, elements become more acidic due to increasing electronegativity pulling electron density towards the nucleus, making it easier to donate a proton. Conversely, as you move down a group, elements become more basic due to larger atomic size and higher electron shielding, allowing for easier acceptance of a proton. However, there are exceptions to these trends based on specific chemical properties and bonding characteristics of elements.


What are the three concepts that can be used to explain the different periodic trends?

Atomic size: Refers to the distance between the nucleus and the outermost electrons. It decreases across a period due to increasing nuclear charge pulling electrons closer. Ionization energy: The energy required to remove an electron from an atom. It increases across a period due to stronger nuclear charge. Electronegativity: The ability of an atom to attract electrons in a chemical bond. It increases across a period due to stronger nuclear charge and smaller atomic size.


What is is the trend across a period?

The trend across a period refers to how a property of elements changes as you move from left to right across a row in the periodic table. For example, in terms of atomic size, the trend across a period is generally a decrease due to the increasing number of protons in the nucleus pulling the electrons closer.

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can you help me