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We discuss the lateral distribution of charged particles in extensive airshowers with energy above $10^{17}$ eV measured by surface scintillationdetectors of Yakutsk EAS array. The analysis covers the data obtained duringthe period from 1977 to 2013. Experimental values are compared to theoreticalpredictions obtained with the use of CORSIKA code within frameworks ofdifferent hadron interaction models. The best agreement between theory andexperiment is observed for QGSJet01 and QGSJet-II-04 models. A change in thecosmic ray mass composition towards proton is observed in the energy range$(1-20) \times 10^{17}$ eV.

Mass composition of cosmic rays with energy above 10**17 eV according to surface detectors of the Yakutsk EAS array