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www.reference.com/article/services-quizlet-b930bd6e07539986

Quizlet allows users to create and browse over 40 million previously created study sets and quizzes. Study sets contain flash cards, quizzes, audio training and games designed to help individuals study various topics. Quizlet is also available as an app on iPhone and Android mobile devices.

www.reference.com/article/quizlet-cards-6f0889046cdb01b2

Quizlet cards are virtual flash cards created by the users of Quizlet.com. Teachers use Quizlet to provide online study resources for their students. Learners locate relevant study cards to assist in studying particular subjects. To access Quizlet, users must first register through Google, Facebook

www.reference.com/article/things-can-quizlet-app-5ec8d8e1fa8c7af3

The Quizlet app is a mobile version of Quizlet.com, so the app provides the study tools, flash cards, and games that are found on the website. All content on the site and app is user generated.

www.reference.com/article/use-quizlet-flash-cards-eaf4c5dc42c4892b

As of 2015, signing up for Quizlet flashcards is free, although users have the option to add superpowers to their accounts for a modest charge. Once logged in, users create study sets, record voices or study from existing sets. Creating a class group makes group study possible.

www.reference.com/article/can-quizlet-practice-tests-taken-bc235ed3d739759

Quizlet practice tests on many different subjects are available at Quizlet.com. To take these tests, users must first sign up at the website using Facebook, Google or their email address. Quizlet is available on home or school computers as well as through iOS and Android mobile apps.

www.reference.com/article/create-quizlet-flashcards-2116c461d65f7cf3

To create Quizlet flashcards, visit the site at Quizlet.com and click on the icon indicating Create a Set. Next select the language of reception, typically English or Spanish, and then the language to be translated. You can create up to 2,000 pairs of flashcards per set.

www.reference.com/article/charges-protons-neutrons-electrons-77a5919012729443

Atoms have positive protons, no charge neutrons and negative electrons. The positive and the negative describes the charge of the atom.

www.reference.com/science/discovered-protons-electrons-neutrons-9874fd87055357be

The discoveries of electrons, protons and neutrons were made by J. J. Thomson, Ernest Rutherford and James Chadwick respectively. They were staggered over a period of 35 years.

www.reference.com/article/many-protons-neutrons-electrons-iron-468c62eccffa36a3

Iron has 26 protons, 26 electrons and 30 neutrons. Iron has the atomic number of 26 and the atomic symbol Fe.

www.reference.com/article/many-protons-neutrons-electrons-sodium-aaf54c880fb232a4

The element sodium has 12 neutrons, 11 electrons and 11 protons. The number of electrons and protons come from the element's atomic number, which is also 11. The number of neutrons can be found by subtracting the atomic number from sodium's atomic mass of 23.