I have an answer key I really need to know how to solve this
THANK YOU in advance
2006-07-25 12:54:39 · 8 answers · asked by j h 2 in Science & Mathematics ➔ Chemistry
the mass number is the number of protons and neutrons in the nucleus. Since it has a positive 2 charge that means it has 2 less electrons than protons. Strontium has an atomic number of 38 - which is the same as the number of protons. To find the number of neutrons subtract the atomic number from the mass number.
2006-07-25 13:19:03 · answer #1 · answered by Shawna 3 · 1⤊ 0⤋
The first thing you need to know is Strontium's atomic number. Look this up in a periodic table and find 38. This is the number of protons. If the mass is 87 and the protons are 38, the neutrons are 87-38 = 49. If the charge is +2 and the protons are 38, the electrons are 38-2 = 36.
2006-07-25 13:01:02 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Strontium is atomic number 38. That means that it has 38 protons. To find neutrons you subtract the atomic number from the atomic mass 87 - 38 = 49 neutrons.Generally an atom has the same number of electrons as protons, but plus 2 means it has given away 2 electrons.So the number of electrons is 36.It has a plus 2 charge because the protons are positive and the electrons are negative, and it has 2 more protons than electrons.
2006-07-25 13:08:35 · answer #3 · answered by science teacher 7 · 0⤊ 0⤋
If Sr is not charged, then it has 38 protons, 38 electrons, and 49 neutrons (87-38). The mass number (38 for Sr) is equal to the number of protons. Number of electrons is equal to the number of protons. And number of neutrons is equal to the difference of Mass number and number of protons.
If it is charged, in this case we have a +2(plus 2) charge. it means that the atom have lost its 2 electrons. So the number of protons will still be equal to the mass number so it is 38. Since it is a charged atom, number of electrons is no longer equal to number of protons. A +2 charge means that it lost 2 electrons so we will minus 2 from 38, so the number of electrons is equal to 36. The number of neutrons is not affected so it would still be (87-38) which is 49.
If an atom has a -2(minus 2) charge, then it means that the atom have gained 2 electrons. So to find the number of electrons, just simply add 2 to the number of protons. The number of protons and neutrons are not affected since the two reside in the nucleus of the atom and are not participating in the reaction whereas the electrons move around the nucleus and are involved in the reactions.
2006-07-25 14:03:59 · answer #4 · answered by k9 1 · 0⤊ 0⤋
electrons=36
protons=38
neutrons=49
atomic number=38
mass number=87
2006-07-27 01:18:16 · answer #5 · answered by Yonamaria 2 · 0⤊ 0⤋
the atomic* huge type is basically the form of protons that the atom has. The mass huge type is the form of protons and neutrons further mutually. The can charge is the form of protons - the form of electrons (it extremely is because of the fact protons have a can charge of +a million neutrons have a impartial can charge of 0 electrons have a can charge of -a million) desire it helps occasion - answer a) atomic huge type = 6, mass huge type = 13, can charge = (6-5) = a million...
2016-12-14 13:55:41 · answer #6 · answered by ? 4 · 0⤊ 0⤋
Atomic Number Of Strontium
2017-01-05 06:58:53 · answer #7 · answered by Erika 4 · 0⤊ 0⤋
Strontium Atomic Number
2016-09-28 21:05:18 · answer #8 · answered by Anonymous · 0⤊ 0⤋
you really need to know how to solve this
hmmmmmm
that translates into the teacher saying "SHOW YOUR WORK"
do your own homework, goofball
2006-07-25 12:58:41 · answer #9 · answered by Anonymous · 0⤊ 0⤋