NA MA 54 Ar Which metal has valency 3 among above? b. Which metal is more active between 'O' and 'S'? why? c. What change in atomic size is found when we move from sodium to rightward and whe effect does it cause on the reactivity of elements? 23. Sketch a neat diagram of neuron and label the parts, which carry impulse to the cell body or exton and away from the cyton. Give an example showing interrelation betweer nervous system and glandular system. 24. proper implementation of Kyoto protocal would help to cope the globel warming9, how​

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock