What was discovered first nucleus electron proton neutron?

First it was discovered by Ernest Rutherford that atoms had an area of condensed positive charge in the centre, which he called the nucleus. Then the particles that made up the nucleus were identified as protons, and then the smaller charges around the nucleus were found and called electrons. Then to explain the mass of the nucleus the existence of the neutron was hypothesised and confirmed.

Why are large anions polarised more easily then small anion?

This is because the outermost or valence electrons experience very less attraction from the nucleus. Thus those electrons are easily attracted and hence making the ion polarised.

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How do you draw a Lewis structure for BeH2?

H-Be-H. This is an exception to the octet rule.

What is the complete set of quantum numbers for the fifth electron added to a hydrogen ion?

A hydrogen ion is a proton, and that cannot bind more than 1 electron. For Boron, which has charge 5 on the nucleus the electrons are 1s2 2s2 2p1

What is the electron configuration of silicon?

The element silicon (atomic number 14) has the following electron configuration :

- Full configuration: 1s² 2s² 2p⁶ 3s² 3p² - Compressed (without all standard script numbers): 1s² 2s²p⁶ 3s²p²

- Noble Gas form : [Ne] 3s² 3p² / [Ne] 3s²p² (this works because [Ne] symbolizes the electronic configuration of Neon, which is 1s² 2s² 2p⁶. When added to 3s²p², it is equivalent to the full electron configuration of Silicon, when neutral.)

EQtm !≤m Etm

Is EQtm not mapping reducible to Etm ?

How many core electrons in xenon?

19

What is the mass for C12 atom?

12 (exact by definition) grams/Avogadro's Number = about 12/6.022 X 10²³ = 1.993 X 10^-23 grams.

Stat 330 Exam 2 Solution

Stat 330 Exam 2 Solution 

Stat 330 Exam 1 Solution

Stat 330 Exam 1 Solution

Stat 330 Spring 2011 Homework solutions

Stat 330 Spring 2011 Homework solutions


Solution for HW 1
Solution for HW 2
Solution for HW3
Solution for HW4
Solution for HW5
Solution for HW6
Solution for HW7
Solution for HW8
Solution for HW9
Solution for HW10
Solution for HW11

How are elements atoms molecules chemical bonds compounds mixtures and substances related?

Elements and atoms are mainly the same. Molecules are made up of atoms and chemical bonds are bonds that combine the atoms together to make molecules. Compounds are just about the same as molecules only are made up of molecules like how molecules are made of atoms. Substances can relate to anything, and mixtures are many compounds and molecules mixed together.

Which bonding holds atoms together in a biological molecule?

Covalent

How many neutrons are there in isotope Rn 220?

220 -86 = 134 neutrons

5 Tips to Declutter your College Inbox

Your collegiate email inbox can quickly fill up with irrelevant emails that take up space and make it harder for you to find important emails- like reminders about class projects or inquiries from employers! So it is a good idea to keep your mailbox nice and tidy. It will also save you time in the end.

1. Turn off email notifications from Facebook. You check it enough. Why do you need emails of notifications? Same with the phone. Turn them off. They are simple distractions that you don't need.

2. Turn off email notifications from Twitter. It's nice to see you have been retweeted, or you have a new follower, but what does it matter? It only causes you to have one more email and a few more minutes of time wasted due to checking your twitter after receiving that email.

3. Desubscribe from newsletters to websites. Websites love to send you newsletters. They want your attention on their site. When you're checking your college email, that isn't the time to be looking up the latest magazine newsletter. Send them to your personal email or another email account for that specific purpose.

4. Create labels / folders, and auto-redirect emails to those folders. Say, Econ 101 emails go to a label "ECON" - that allows you to easily compile all ECON related messages.

5. Turn off notifications from YouTube. This is one of the most important ones. YouTube digest? Do we really need another excuse to watch random videos? Or, you just commented on some video you don't agree with, and now you're getting hate-comments from trolls. You will get emailed letting you know someone responded. Why waste your time responding ? Nothing is going to come from it, except the realization of the time wasted. Turn notifications off and never worry about it again.