Sodium and potassium are soft, silvery metals. they are both solids at room temperature and react strongly when combined with water.

which statement about sodium and potassium is probably true? *26*

a. sodium and potassium are different isotopes of the same element.
b. sodium and potassium have the same number of electrons.
c. sodium and potassium are in the same chemical family.
d. sodium and potassium have similar atomic masses.

Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

Which body part transports oxygen removes waste materials in carries nutrients to the body as part of the circulatory system

The weights of bags filled by a machine are normally distributed with a standard deviation of 0.05 kilograms and a mean that can be set by the operator. at what level should the mean weight be set if it required that only 1% of the bags weigh less than 9.5 kilograms? round the answer to 2 decimal places.