Pls explain the circled poi t

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Refer below for above asked query:-

T h e c o m p o u n d s f o r m e d w i t h p o l y a t o m i c i o n s, t h e n u m b e r o f i o n s p r e s e n t i n t h e c o m p o u n d i s i n d i c a t e d b y e n c l o \sin g t h e f o r m u l a o f a i o n s o u t s i d e t h e b r a c k e t a n d w r i t i n g t h e n u m b e r i o n s o u t s i d e t h e b r a c k e t . E g : - M g (O H)_{2}, i n t h i s c o m p o u n d t h e p o l y a t o m i c i o n i s 2 s o i t i s p l a c e d o u t s i d e t h e b r a c k e t . I n c a s e o f c o m p o u n d w h e r e p o l y a t o m i c i o n i s o n e, b r a c k e t s a r e n o t r e q u i r e d . E g : N a O H

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