<span>Chlorine has 17 electrons in it natural state but it gains an electron and becomes an anion with 18 electrons. </span>
Potassium (K) has 19 electrons in its natural state. It loses an electron and becomes K+ and then is left with 18 <span>electrons .
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The atomic number of calcium is 20 i.e. Ca has 20 electrons.It Loses 2 electrons and becomes Ca++ and has 18 electrons.
Answer:
To ensure provide and reliable data
Explanation:
Calibration ensures precise repeatable performance while preventing pipetting errors. Just the way measurement standards are established to distinguish valid and invalid processes, pipette calibration standards are designed to ensure the best pipette accuracy.
Answer: 9. decomposition 10. single displacement 11. synthesis 12. double displacement
Explanation: just know I know
Water is a pure substance, however it is made up of oxygen and hydrogen atoms, hence the nickname H2O (Hydrogen2, Oxygen)
by applying the equation :
n = N/L
where
n = mol
N = number of molecules
L = avagardro constant
therefore :
N = n × L
= 9.95mol × 6.022 ×10²³ mol-¹
= 59.9189
(this has no units)
