Question

the atomic number of element is x is 9 and number of neutron present in necleus is10, calculate mass number​

Answer 1

Answer:

1

Step-by-step explanation:

atomic number neon this question where from pic

Answer 2

Answer:

$atomic \: number \: = no. \: of \: proton \\ = no. \: electron \\ mass \: no.\: = no. \: of \: proton \: + neutron$

Step-by-step explanation:

$atomic \: no. = 9 = no. \: of \: proton \\ mass \: no. = 9 + 10 = 19$

$some \: facts \\1. \: mass \: no. \: is \: also \: called \: atomic \\ mass. \\ 2. \: charge \: of \: electron \: is \: negative \\ but \: charge \: of \: proton \: is \: positive . \\ 3. \: charge \: of \: neutron \: is \: neutral \\ neither \: positive \: nor \: negative \\ 4. \: so \: the \: charge \: of \: necleus \\ = charge \: of \: proton \: \\ + charge \: of \: neutral = positive$

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