A strontium-90 atom that has a lost two electrons has protons, neutrons, and __ electrons.

1 answer:

4 0

Answer:
A strontium-90 atom that has a lost two electrons has 38 protons, 52 neutrons, and 36 electrons.

Explanation:
Atomic number of Strontium (Sr) is 38.
Atomic number = number of protons
Hence, Strontium has 38 protons.

If the element is in neutral state,
number of protons = number of electrons.
Then, neutral Strontium atom should have 38 electrons.
But the question says Sr has lost 2 electrons. Hence, number of electrons should be 38 - 2 = 36.

Mass number = number of protons + number of neutrons.

The given mass number is 90. Hence, number of neutrons should be 90 - 38 = 52.

You might be interested in

An iron nail with a mass of 12 grams absorbs 12 Joules of heat. If the nail was initially at 25°C, what is the final temperature

elena-s [515]

The answer to “An iron nail with a mass of 12 g absorbs 15 J of heat. If the nail was initially at 28 °C, what is its final temperature?” is broken down into a number of easy to follow steps, and 27 words. Since the solution to 81P from 3 chapter was answered, more than 4841 students have viewed the full step-by-step answer. The full step-by-step solution to problem: 81P from chapter: 3 was answered by , our top Chemistry solution expert on 05/06/17, 06:45PM. Introductory Chemistry was written by and is associated to the ISBN: 9780321910295. This textbook survival guide was created for the textbook: Introductory Chemistry, edition: 5. This full solution covers the following key subjects: nail, iron, heat, initially, final. This expansive textbook survival guide covers 19 chapters, and 2045 solutions.

8 0

3 years ago

Lead is listed below zinc in the activity series.

nikdorinn [45]

Answer:

Zn+Pb(NO3)2→Zn(NO3)2+Pb

3 0

3 years ago

Read 2 more answers

A d d m y s n a p gianavaughn007 ;)

vodomira [7]

Lol I don’t have snap. But I’m only texting this cause this app wants me to answer some questions. But! Lol have a great day/night