The statement that best describes the trend in first ionization enery of elements on the periodic table is:
<span>It generally decreases down a group because valence electrons are farther from the nucleus.
The first ionization energy measures how difficult is to release an electron from the outermost shell. The higher the ionization energy the more difficult it is to release an electron, the lower the ionication energy the easier to release an electron.
As the atomic number of the atom increases (which is what happens when you go down a group) the furthest the outermost shell of electrons will be (the size of the atoms increases) and so those electrons require less energy to be released, which means that the ionization energy decreases.
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Answer:Chromosomal mutations all happen during meiosis. Chromosomes in meiosis have the opportunity to line up and cross over. This mixes up the genetic information from the parents in the sperm or egg. However, during crossing over things can go wrong.
Explanation:
Answer:
Chemical reaction are irreversible. Some of the example of chemical reaction are cooking, rusting, and burning. During a chemical reaction, the composition of substances changes and the particles rearrange to form a new substance. The new substance formed after chemical reaction of substance has different physical and chemical properties.
When a chemical reaction occur, the atoms or molecules of the substances change its physical and chemical properties such as while cooking of vegetable, the molecules of vegetable undergo changes in their properties and form a new substance which is different from the earlier.
Answer:
Frequency = 0.8×10¹⁵ Hz
Explanation:
Given data:
Frequency of photon = ?
Wavelength of photon = 3.75 ×10⁻⁷ m
Solution:
Formula:
Speed of photon = wavelength × frequency
Frequency = speed of photon / wavelength
Now we will put the values in formula.
Frequency = 3 ×10⁸ m/s / 3.75 ×10⁻⁷ m
Frequency = 0.8×10¹⁵ s⁻¹
s⁻¹ = Hz
Frequency = 0.8×10¹⁵ Hz
Answer:
The longest wavelength of radiation with enough energy to break a carbon–carbon bond is 343.75 nm.
Explanation:
E = hc/λ
E: energy = 348 000 J / 6.022 x 10²³ = 5.7788 x 10⁻¹⁹ J
h: Planck's constant = 6.62607004 × 10⁻³⁴ J.s
c: speed of light = 299 792 458 m / s
λ: wavelength
λ = hc/E
λ = (6.62607004 × 10⁻³⁴ J.s x 299 792 458 m / s) / 5.7788 x 10⁻¹⁹J
λ = 3.4375 x 10⁻⁷ m
λ = 343.75 nm
