Answer: Any Alkali metal
Explanation:
T he cool thing about the periodic table is the way it is organized. You can find chemical with similar properties is just looking in the column they are in in to determine the answer. Since Na is in the first column, any of these answer can work:
Li, K, Rb, Cs, and Fr
It is thought that Milankovitch cycles caused past ice age climates.
This cycle is related to the movement of earth
The cycle has three parts eccentricity, axial tilt, and precession. These three are supposed to be deciding factor for the amount of heat reaching on earth from sun
thus the complete Milankovitch cycle do affect the temperature and hence the climate on earth.
a. <em>Monatomic ions
</em>
Cs is in Group 1. It has <em>one valence electro</em>n that it can lose to form a Cs⁺ ion.
Mg is in Group 2. It has <em>two valence electrons</em> that it can lose to form an Mg²⁺ ion.
N is in Group 15. It can gain <em>three valence electrons</em> to complete its octet and form an N³⁻ ion.
b. <em>Ionic compounds</em>
In an ionic compound there must be the same number of positive and negative charges.
It takes <em>three Na⁺ ions</em> to balance the charge on <em>one N³⁻ ion</em>, so the formula of sodium nitride is Na₃N.
It takes <em>three Mg²⁺ ions</em> (charge = +6) to balance the charge on <em>two N³⁻ ions</em>
(charge = -6), so the formula of magnesium nitride is Mg₃N₂.
Mass number = number of protons + number of neutrons
number of protons = atomic number =7
number of neutrons= mass number - number of protons=16-7=9
Answer is B.9.