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pennyroyal    
n. 薄荷类,薄荷油

薄荷类,薄荷油

pennyroyal
n 1: Eurasian perennial mint have small lilac-blue flowers and
ovate leaves; yields an aromatic oil [synonym: {pennyroyal},
{Mentha pulegium}]
2: erect hairy branching American herb having purple-blue
flowers; yields an essential oil used as an insect repellent
and sometimes in folk medicine [synonym: {pennyroyal}, {American
pennyroyal}, {Hedeoma pulegioides}]


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  • When Does Atomic Radius Increase on the Periodic Table
    The strongest driver of increasing atomic radius is moving down a group on the periodic table Each step down adds a new principal energy level, which means electrons occupy orbitals that are physically farther from the nucleus
  • 3. 2: Trends in Size - Chemistry LibreTexts
    Proceeding down the groups of the periodic table, we find that cations of successive elements with the same charge generally have larger radii, corresponding to an increase in the principal quantum number, n
  • 2. 8: Trends in Atomic Size - Chemistry LibreTexts
    Atomic radius increases as we move down a group because the n level (orbital size) increases Atomic radius mostly decreases as we move left to right across a period because the effective nuclear charge experienced by the electrons increases, and the electrons are pulled in tighter to the nucleus
  • Periodic Trends in Atomic Radius
    Atomic radius generally increases as you move down a group in the periodic table because additional electron shells are added Here's the order from smallest to largest atomic radius:
  • How Does Atomic Radius Change Across the Periodic Table?
    Moving from top to bottom within a group, atomic radius generally increases The primary reason is that each successive period introduces an additional principal electron shell
  • Periodic Table Trends: Atomic Radius, Electronegativity, Ionization . . .
    As you move down a group, additional electron shells increase the size of the atom, so atomic radius increases Electron Affinity is the ability of an atom to accept an electron It is measured by the energy change in the atom as an electron is added to the gaseous form of the atom
  • Periodic trends - Wikipedia
    In general, the atomic radius decreases as we move from left-to-right in a period, and it increases when we go down a group This is because in periods, the valence electrons are in the same outermost shell
  • Why Does Atomic Radius Increase as You Go Down a Group?
    Atomic radius increases down a group because each new row of the periodic table adds another shell of electrons, placing the outermost electrons progressively farther from the nucleus
  • How Atomic Radius Increases Across the Periodic Table: Trends, Patterns . . .
    The atomic radius increases as you move down a group in the periodic table because electrons are added to higher energy levels, increasing the distance from the nucleus However, across a period (left to right), the atomic radius decreases due to increasing nuclear charge pulling electrons closer
  • Atomic Radius in Periodic Table Questions with Solutions
    Answer: On moving to the right of a period, the Atomic Radius of elements decreases with an increase in the atomic number And on moving down the group, the Atomic Radius increases due to the increase in the number of energy levels





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