Use the periodic table to determine which of the following could be an isotope of bromine (br). check all that apply. z = 79, a = 196 z = 35, a = 79 a = 79, n = 44 z = 44, n = 44

the second and the third represent isotopes of bromine.

Explanation:

1) Isotopes are elements with same atomic number (Z) and different number of neutrons (N)

The atomic number is the number of protons.

2) A is the mass number and it accounts for the sum of the protons (Z) and neutrons (N).

This is A = Z + N.

Remember that is the number of protons, and all the isotopes of bromine have the same atomic number.

4) Let's see at the atomic numbers for each choice:

i) Z = 79, A = 196

This Z is not 35, so it is not an isotope of bromine (it is an isotope of gold)

ii) Z = 35, A = 79

This, indeed, is the isotope of bromine with mass number 79. The information indicates:

Z = atomic number = 35 ⇒ element bromine

A = mass number = 79

N = number of neutrons = A - Z = 79 - 35 = 44 neutrons

iii) A = 79, N = 44

Calculate Z = A - N = 79 - 44 = 35, which indicates it is an isotope of bromine.

iv) Z = 44, N = 44

Z = 44, already states it is not bromine. It is another element, which you can find in the periodic table. It is Rutenium.

Answer : There are two isotopes of Br 79 and Br 81.

So for Br-79 Z = number of protons = 35

N = number of neutrons = 44

A = mass number (Z+N) = 79

Now, for Br-81;

Z = number of protons = 35

N = number of neutrons = 46

A = mass number (Z+N) = 81.

when—without warning—something provokes your anger, you may struggle not to succumb to it. since what typically makes you mad is feeling powerless in the face of what seems unfair, your anger is mostly an attempt at a “quick fix” to right the balance. it’s as though you’re raising a fist in protest, proclaiming that you’re not going to capitulate to such injustice.

there are, however, a multitude of problems related to this immediate, push-back reaction of anger. and probably the key one is that almost never does it resolve the issue that gave rise to it. such reactive anger is probably best understood as self-defeating. as david burns, the author of the seminal self- book feeling good, observes: if realistically, acting on your anger is to make any sense, it needs to meet two criteria—which, in almost every case, is frankly impossible. that is, your anger must:

be directed toward a person who has intentionally (and needlessly) behaved in a hurtful way toward you; and

be beneficial or advantageous to you (i.e., assist you in achieving a desired goal).

i think you’ll agree that only rarely can you claim that your anger is both warranted and , whether to yourself or the relationship.

so let me offer you a two-step alternative to abandoning your better judgment and giving in to the temptation of anger—one that should neutralize your anger in seconds. or, when you’re really angry, in minutes.

but keep in mind that you must really want to execute these steps, be sufficiently motivated to perform them. which means overcoming more unconscious resistance than you might ever have imagined. because there are many immediate “advantages” of anger that can interfere with your resolve, i’ll suggest a few of them that might interfere with your employing this powerful method to rid yourself of counter-productive anger.

explanation:

the dissolution of polymer can be thermodynamically described in 2 steps.