Use the periodic table to answer the following question. what is the predicted order of first ionization energies from highest to lowest for beryllium, calcium, magnesium, and strontium? a. be > ca > mg > sr b. be > mg > ca > sr c. ca > sr > be > mg d. sr > ca > mg > be

The order is determined as: Be > Mg > Ca > Sr (option B)

Explanation:

The electrons are attracted to the nucleus and it is necessary to provide energy to start them. The ionization energy I is then the energy needed to start an electron to a gaseous atom, isolated and in a fundamental state. The electrons of the last layer are always lost, which are the weakest attracted to the nucleus.

The elements beryllium, calcium, magnesium and strontium, if you place them in the periodic table, are in the same group. In the same group, the size of the atoms increases as they descend in the periodic table. In this way, electrons are found in layers increasingly distant from the nucleus, being less and less attracted to it. This facilitates its extraction from the atom. Finally, the ionization energy decreases as it descends in a group.  Following this criterion, the order is determined as: Be > Mg > Ca > Sr (option B)

1st question- Be > Mg > Ca > Sr

2bd question- P > S > Si > Al

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explanation:

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.