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PERGAMON INTERNATIONAL LIBRARY of S c i e n c e , T e c h n o l o g y , Engineering and S o c i a l S t u d i e s The 1000'Volume original paperback industrial training and the enjoyment library in aid of of leisure education, Publisher: Robert Maxwell, M.C. The Chemistry of THE MONATOMIC GASES .Publisher's Notice to Educators THE PERGAMON TEXTBOOK INSPECTION COPY SERVICE An inspection copy of any book suitable for use as a course text for undergraduate or graduate students will gladly be sent for consideration for adoption without obligation. Copies may be retained for a period of 30 days from receipt and re turned if not suitable. When a particular title is adopted or recommended for adoption for class use and the recommendation results in a sale of 12 or more copies, the inspection copy may be retained with our compliments. If after exam ination the lecturer decides that the book is not suitable for adoption but would like to retain it for his personal library, then our Educators' Discount of 10% is allowed on the invoiced price. Comprehensive Inorganic Chemistry EOnORIAL BOARD J. C. B A I L A R JR., Η. J . E M E L Ι U S , F.R.S., Urbana Cambridge t S I R R O N A L D N Y H O L M , F.R.S., A. F. T R O T M A N - D I C K E N S O N , (Executive Editor) London Cardiff The Chemistry of THE MONATOMIC GASES A . H . C o c k e t t , K . C . S m i t h , Neu Bartlett and F. O . Sladky Chapters 5 a n d 6 o f Comprehensive Inorganic Chemistry P E R G A M O N OXFORD SYDNEY . PRESS NEW YORK PARIS . . TORONTO BRAUNSCHWEIG Pergamon Press Offices: U.K. Pergamon Press Ltd., H e a d i n g t o n Hill Hall, Oxford, O X 3 OBW England U.S.A. Pergamon Press Inc., Maxwell H o u s e , Fairview Park, Elmsford, N e w Y o r k 10523, U . S . A . CANADA Pergamon o f Canada Ltd., 207 Queen's Quay W e s t , T o r o n t o 1, Canada AUSTRALIA Pergamon Press (Aust.) Pty. Ltd., 19a Boundary Street, Rushcutters Bay, N . S . W . 2 0 1 1 , Australia FRANCE P e r g a m o n Press S A R L , 2 4 rue des E c o l e s , 75240 Paris, Cedex 0 5 , France WEST G E R M A N Y Pergamon Press G m b H , D - 3 3 0 0 Braunschweig, Postfach 2 9 2 3 , Burgplatz 1, West G e r m a n y Copyright © P e r g a m o n Press 1973 All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, electrostatic, magnetic tape, mechanical, photocopying, recording or otherwise, without permission in writing from the publishers First edition 1973 Reprinted, with corrections, from Comprehensive Inorganic Chemistry. 1975. Library of Congress Catalog Card N o . 77-189736 Printed in Great Britain by A. Wheaton ٢ I S B N 0 08 018782 X (hard cover) I S B N 0 08 018781 1 (Flexicover) Co,.Exeter PREFACE T h e excellent r e c e p t i o n t h a t h a s b e e n a c c o r d e d t o Compre hensive Inorganic Chemistry since t h e s i m u l t a n e o u s p u b l i c a t i o n of t h e five v o l u m e s of t h e c o m p l e t e w o r k h a s b e e n a c c o m p a n i e d b y t h e p l e a t h a t sections s h o u l d b e m a d e available in a f o r m t h a t w o u l d e n a b l e specialists t o p u r c h a s e copies for t h e i r o w n use. T o m e e t this d e m a n d t h e p u b l i s h e r s h a v e decided t o issue selected c h a p t e r s a n d g r o u p s of c h a p t e r s as s e p a r a t e e d i t i o n s . T h e s e c h a p t e r s will, a p a r t f r o m t h e c o r r e c t i o n s of m i s p r i n t s a n d t h e a d d i t i o n of p r e f a t o r