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Cobalt comes first because it has fewer protons (27) and nickel has more (28). The Atomic Mass is not important in the modern Periodic Table (but that's all they knew in Mendeleev's day).
The reason cobalt is heavier is because it has more NEUTRONS (32).
What else can I help you with?
Which Elements that are naturally magnetic at room temperature?
Iron, cobalt, and nickel are the elements that are naturally magnetic at room temperature.
What elements are similar to iron?
What elements are similar to iron in a chemical property on the Periodic Table
What elements on the periodic table are greater than 23?
Elements greater than 23 on the periodic table include vanadium (23), chromium (24), manganese (25), iron (26), cobalt (27), nickel (28), copper (29), zinc (30), and so on.
State which two elements from the first 20 elements of the modern periodic table are not arranged in order of increasing atomic mass?
Cobalt and Nickel are the two elements from the first 20 elements of the periodic table that are not arranged in order of increasing atomic mass. This is due to the placement of cobalt with a slightly lower atomic mass compared to nickel, which occurs due to the meticulous arrangement of elements based on their chemical properties and not just atomic masses.
Can pure iron can be separated by a magnet?
Cobalt and nickel are also magnetic elements.
Which two elements in the fourth period violate the original periodic law as stated by Mendeleev?
Cobalt and nickel. They were placed before expected elements based on increasing atomic mass due to their similar chemical properties, violating Mendeleev's original periodic law.
What element is heavier tha cobalt but lighter than copper?
The atomic weight of nickel lies in between that of cobalt and copper.
Does nickel have Cobalt in it?
Nickel and Cobalt are both elements, which means they are pure. Therefore, the do not contain anything else, so Nickel does not have Cobalt in it.
Is colbalt an element mixture or a compound?
Cobalt (Co) is a metal it is an element on the periodic table of the elements it is number is 27 cobalt is a cross between iron (FE) and nickel (NI)
Which Elements that are naturally magnetic at room temperature?
Iron, cobalt, and nickel are the elements that are naturally magnetic at room temperature.
What elements are similar to iron?
What elements are similar to iron in a chemical property on the Periodic Table
What elements compose Alnico?
aluminum nickel and cobalt
What are the 3 elements that are magnet?
Iron, Nickel and Cobalt
Is iron triad a nonmetal?
No, the iron triad refers to the elements iron, cobalt, and nickel, which are metals.
Which elements are magnetic?
cobalt and nickel classically, it's iron AlNiCo (Aluminum, Nickel and cobalt) makes a great magnet.
Why is co placed before ni on the periodic table?
Keep in mind that the atomic mass of an element is based on an average of relative abundance of stable isotopes. Nickel has several stable isotopes and Cobalt I believe has only one stable isotope. The weighted average proportionally to the relative abundance of the several Nickel isotopes is less than the average of Cobalt's isotope(s). So basically Though Nickel has a greater atomic number and the trend is for this to correlate with atomic mass because nickel exists in relatively large proportion as a lighter stable isotope Nickels average atomic mass is less than Cobalt's atomic mass. Google about relative abundance and calculating atomic mass to find all sorts of interesting things!
What are often used elements in magnets?
Cobalt, iron, gadolinium, nickel, neodimyum
