If the half-life of substance Z is 2.5 years, how long would

ich sub shell corresponds to each of the following sets of quantum numbers a n 7 1 2 b n 3 1 0 c n 5 1 3 d n 2 1 1

Choose the one set of quantum numbers that contains an error On 3 1 2 ml 1 On 5 1 3 ml 2 On 3 1 2 ml 0 On 5 1 4 ml 3 On 3 1 0 ml 2

Use the given data to calculate the atomic mass of Chlorine Show your work and use correct number of significant figures Natural Percent Abundance 3517C1 75 7700 3717CL 24 2300 Average Mass 34 9690 36 9660

KProblem Set 3 Ch 2 Exercise 2 57 Enhanced with Feedback MISSED THIS Watch KCV 2 6 Read Section 2 6 You can click on the Review link to access the section in your e Text Part A Which electron is on average closer to the nucleus an electron in a 2s orbital or an electron in a 3s orbital Match the items in the left column to the appropriate blanks in the sentences on the right 3s 28 increases decreases my The size of the orbital is determined by the Reset Help quantum number so the size of the orbital as this value increases Therefore an electron in a orbital is closer to orbital the nucleus than is an electron in a

Match each rule or principle with the correct description At most two electrons may occupy an orbital and they have opposite spins Start at 1s and build up from there into higher energy levels In each level electrons first fill singly before doubling up Choose Choose The Bohr model principle The Heisenberg uncertainty principle The Pauli exclusion principle Hund s rule The quantum mechanical rule

Which of the following statements is are true Select all that apply 2 The 2s orbital of a helium atom is lower in energy than a 2p orbital in the hydrogen atom At a given energy level the d orbital electrons can penetrate to the nucleus more than the s orbital electro O Outer shell electrons are shielded from the nucleus by inner shell electrons The 2s orbital of a hydrogen atom is lower in energy than a 2p orbital in the hydrogen atom None of the above statements is true

Match the scientist in the left column with the proper description in the right colur Clear All Johann Dobereiner John Newlands Julius Lothar Meyer Dimitri Mendeleev Emphasized how useful the table could be in predicting the existence and properties of still unknown elements Suggested elements should be arranged in octaves First chemist to recognize patterns between elements and properties German chemist who conceived of the present form of the

Atoms become more stable with eight electrons in their outer energy level Select one O a Opposite ions repulsion O b Protons are shared between atoms O c A proton is transferred from one atom to another Od Two atoms share a pair of electrons

19 9 g 0 Express your answer in molecules to three significant figures

Use the molecular orbital diagram shown to determine which of the following are paramagnetic Atomic orbitals 2p 2s F 2 O Ne 0 2 Molecular orbitals Pip P2P 52p 25 0 F Ne 2s Atomic orbitals 2p