Radioactive Decay Data Disintegration
Half-life
Radioactive Isotope
140-14N
5.7x103
40K-40AR; 40K-40Ca
1.3x10
238U— 206Pb
4.5x10
87Rb-87Sr
4.9x1010

Please someone help I don’t understand it’s this science question please help

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Ineed ! i have no clue how to do this problem.